A buffer consists of a weak acid and is salt.

A buffer consists of a weak acid and is salt.
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1 Answer

Answer :

(i) CH3COOH + CH3COONa
(ii) C6H5COOH + C6H5COONa
(iii) H2CO3 + NaHCO3
(iv) H3PO3 + NaH2PO4
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Related questions

What is buffer capacity?

Description : What is buffer capacity?

Last Answer : The amount of acid or base which a buffer can absorb without significant charge in PH is called buffer capacity. Buffer capacity is the ability of buffer to resist the change in its PH value.

Discuss the factors on which buffer PH depends.

Description : Discuss the factors on which buffer PH depends.

Last Answer : PH of buffer depends upon two factors. (i) Pka or ka value of an acid (ii) Concentration of salt and acid taken for the buffer.

Why we need buffer solution in daily life?

Description : Why we need buffer solution in daily life?

Last Answer : Buffers can resist the charge of its PH value therefore they are required in chemical analysis, pharmaceuticals, electroplating, photography, beverage industry, microbiology molecular biology, soil science and in quantitative ... PH 7.35. If it decreases upto 7 or goes upto 8 death may occur.

What is weak electrolyte?

Description : What is weak electrolyte?

Last Answer : A compound which is only partially ionized in aqueous solution is called as weak electrolyte.e.g CH3COOH(Acetic aci)

What are conjugate acid and bases?

Description : What are conjugate acid and bases?

Last Answer : When an acid is dissolved in water it will form H3O+ ions and an anion the anion of an acid is called conjugate base and H3O+ is called conjugate acid e.g. CH3OOH + H2O H3O+ + CH3COO– Acid Base Conjugate acid Conjugate base

What is solubility product?

Description : What is solubility product?

Last Answer : The product of molar solubilities of the ions of weak electrolyte at equilibrium stage is called solubility product. It is represented by Ksp

What is common ion effect?

Description : What is common ion effect?

Last Answer : The decrease in ionization of a weak electrolyte by adding another strong electrolyte having common ion.e.g ionization of NaCl is decreased by passing HCl through NaCl solution.

How can you co–relate Ka with Kc?

Description : How can you co–relate Ka with Kc?

Last Answer : Ka is dissociation constant of an acid while Kc is the equilibrium constant suppose an acid HA Ionize as HA + H2O  H3O+ + A– Kc = concentration of [H2O] almost remains constant so we can write. Kc = Kc [H2O] = ka Ka =

How can you purify NaCl by common ion effect?

Description : How can you purify NaCl by common ion effect?

Last Answer : The impurities present in the common salt are CaCl2 MgCl2 and Na2SO4 in it. These impurities can be removed by common Ion effect. For this purpose a saturated solution of NaCl is prepared. Then ... electrolyte than NaCl Ionization of NaCl is suppressed by passing HCl gas and it is precipitated out.

Prove that Kw is ionic product of water and its value is 1 x 10–14 at 25o.

Description : Prove that Kw is ionic product of water and its value is 1 x 10–14 at 25o.

Last Answer : Water undergoes self ionization as 2H2O  H3O+ + OH– or H2O  H+ + OH– Kc [H2O] = [H+] [OH–] Kw = [H+] [OH–] At 25oC the value of Kw ionic product have been measured. Its value is 1 x 10–14.

What is the relationship b/w kc, kp kc & kn?

Description : What is the relationship b/w kc, kp kc & kn?

Last Answer : These four parameters are related as. Kp = Kc (RT)n = Kx (P)n = Kn When mole of products are reactant are equal i.e. n = 0 their Kp = kc = dx = kn

How the change in pressure at equilibrium position effect the following reaction? PCl5 PCl3 + Cl2

Description : How the change in pressure at equilibrium position effect the following reaction? PCl5 PCl3 + Cl2

Last Answer : According to Le–chatlier’s principle, by increasing pressure the reaction will move toward less number of moles. In the above reaction, by increasing pressure the reaction will move in backward direction.

A catalyst does not change the position of equilibrium but this equilibrium position approach earlier. Why?

Description : A catalyst does not change the position of equilibrium but this equilibrium position approach earlier. Why?

Last Answer : A catalyst decrease the energy of activation required by reacting substance so the position of equilibrium reaches earlier.

What are optimum conditions for the formation of NH3 by Haber’s process?

Description : What are optimum conditions for the formation of NH3 by Haber’s process? N2(g) + 3H2(g) 2NH3(g) H = -92.46 kJ/m

Last Answer : (i) As the reaction is exothermic max yield is obtained at low temp. (ii) By applying pressure, more product is obtained. According four moles of reactants produce two moles of product so by applying ... (vi) Rate of reaction can also be increase with the help of catalyst like iron or iron oxide.

How value of Kc can help to predict the extent to which a chemical reaction can take place?

Description : How value of Kc can help to predict the extent to which a chemical reaction can take place?

Last Answer : The extent of reaction depends upon the magnitude of Kc. i.e. (i) Very small value of Kc: when Kc is very small the forward reaction will not occur to an appreciable extent ... neither very large nor very small, the equilibrium mixture contains appreciable amounts of both reactant and products.

How Kc can be applied to calculate direction of chemical reaction?

Description : How Kc can be applied to calculate direction of chemical reaction?

Last Answer : (i) If < Kc Then the reaction will proceed in the forward direction until the equilibrium is established. (ii) If > Kc Then the reaction will proceed in the backward direction until the equilibrium is established. If = kc Then the reaction is already in equilibrium.

Define Le–Chatlier’s principle.

Description : Define Le–Chatlier’s principle.

Last Answer : If a system in equilibrium is disturbed at equilibrium it will move in that direction where change is minimized.

What are reversible reaction?

Description : What are reversible reaction?

Last Answer : Those reactions in which the reactants products are converted into each other under same set of conditions.

What is meant by state of chemical equilibrium?

Description : What is meant by state of chemical equilibrium?

Last Answer : The state of reversible reaction, in which forward and reverse rates are equal.(Rf=Rr)

The percentage degree of hydrolysis of a salt of weak acid (HA) and weak base (BOH) in its 0.1 M solution is found to be `10%.` If the molarity of the

Description : The percentage degree of hydrolysis of a salt of weak acid (HA) and weak base (BOH) in its 0.1 M solution is found to be `10%.` If the molarity of the

Last Answer : The percentage degree of hydrolysis of a salt of weak acid (HA) and weak base (BOH) in its 0.1 M solution is ... A. `5%` B. `10%` C. `20%` D. none

An indicator is one kind of the following compound (a) Reducing agent. (b) Salt (c) Base (d) Weak base or acid only

Description : An indicator is one kind of the following compound (a) Reducing agent. (b) Salt (c) Base (d) Weak base or acid only

Last Answer : (d) Weak base or acid only

Ammonium salts decompose quite readily on heating : (i) Ammonium salt of weak oxidizing anion (e.g. `Cl^(-), CO_(3)^(2-), SO_(4)^(2-)`) `overset("heat

Description : Ammonium salts decompose quite readily on heating : (i) Ammonium salt of weak oxidizing anion (e.g. `Cl^(-), CO_(3)^(2-), SO_(4)^(2-)`) `overset("heat

Last Answer : Ammonium salts decompose quite readily on heating : (i) Ammonium salt of weak oxidizing anion (e.g. `Cl^(-), CO_(3) ... N_(2)` D. `NO, NH_(3), N_(2)O`

Ammonium salts decompose quite readily on heating : (i) Ammonium salt of weak oxidizing anion (e.g. `Cl^(-), CO_(3)^(2-), SO_(4)^(2-)`) `overset("heat

Description : Ammonium salts decompose quite readily on heating : (i) Ammonium salt of weak oxidizing anion (e.g. `Cl^(-), CO_(3)^(2-), SO_(4)^(2-)`) `overset("heat

Last Answer : Ammonium salts decompose quite readily on heating : (i) Ammonium salt of weak oxidizing anion (e.g. `Cl^(-), CO_(3) ... N_(2)` D. `NO, NH_(3), N_(2)O`

What secretes a buffer that neutralizes the acidity of stomach acid?

Description : What secretes a buffer that neutralizes the acidity of stomach acid?

Last Answer : Need answer

Quantitatively, the most significant buffer system in plasma is (A) Phosphate buffer system (B) Carbonic acid-bicarbonate buffer system (C) Lactic acid-lactate buffer system (D) Protein buffer system

Description : Quantitatively, the most significant buffer system in plasma is (A) Phosphate buffer system (B) Carbonic acid-bicarbonate buffer system (C) Lactic acid-lactate buffer system (D) Protein buffer system

Last Answer : Answer : B

The pH of body fluids is stabilized by buffer systems. The compound which will be the most effective buffer at physiologic pH is (A) Na2HPO4 pKa = 12.32 (B) Na2HPO4 pKa=7.21 (C) NH4OH pKa = 7.24 (D) Citric acid pKa = 3.09

Description : The pH of body fluids is stabilized by buffer systems. The compound which will be the most effective buffer at physiologic pH is (A) Na2HPO4 pKa = 12.32 (B) Na2HPO4 pKa=7.21 (C) NH4OH pKa = 7.24 (D) Citric acid pKa = 3.09

Last Answer : Answer : B

Important buffer system of extracellular fluid is (A) Bicarbonate/carbonic acid (B) Disodium hydrogen phosphate/sodium dihydrogen phosphate (C) Plasma proteins (D) Organic Phosphate

Description : Important buffer system of extracellular fluid is (A) Bicarbonate/carbonic acid (B) Disodium hydrogen phosphate/sodium dihydrogen phosphate (C) Plasma proteins (D) Organic Phosphate

Last Answer : Answer : A

All the following saturated fatty acids are present in buffer except (A) Butyric acid (B) Capryllic acid (C) Caproic acid (D) Capric acid

Description : All the following saturated fatty acids are present in buffer except (A) Butyric acid (B) Capryllic acid (C) Caproic acid (D) Capric acid

Last Answer : Answer : C

Which one of the amino acids could serve as the best buffer at pH 7? (A) Glutamic acid (B) Arginine (C) Valine (D) Histidine

Description : Which one of the amino acids could serve as the best buffer at pH 7? (A) Glutamic acid (B) Arginine (C) Valine (D) Histidine

Last Answer : Answer : D

The saliva pH is approximately 6.8. It is thus a slightly acid pH. Saliva lubricates the food bolus and initiates the enzymatic extracellular digestion of food. It also works as a buffer for the mouth pH and it has an important role of having IgA antibodies (also present in tears, colostrum, mother’s milk and in the mucosae of the intestine and airways) that protect the organism against pathogens.

Description : The saliva pH is approximately 6.8. It is thus a slightly acid pH. Saliva lubricates the food bolus and initiates the enzymatic extracellular digestion of food. It also works as a buffer for the ... 's milk and in the mucosae of the intestine and airways) that protect the organism against pathogens.

Last Answer : What is the salivary digestive enzyme? Which type of food does it digest and into which smaller molecules does it transform the food?

A solution which resists change in its pH value on addition of acid/alkali is called the __________ solution. (A) Neutral (B) Ideal (C) Buffer (D) Zero pH

Description : A solution which resists change in its pH value on addition of acid/alkali is called the __________ solution. (A) Neutral (B) Ideal (C) Buffer (D) Zero pH

Last Answer : Option C

Buffer solutions have constant acidity and alkalinity because: (1) they have fixed value of pH (2) these give unionised acid or base on reaction with added acid or alkali (3) acids and alkalies in these solutions are shielded from attack by other ions (4) they have large excess of H+ or OH– ions

Description : Buffer solutions have constant acidity and alkalinity because: (1) they have fixed value of pH (2) these give unionised acid or base on reaction with added acid or alkali (3) acids and alkalies in these solutions are shielded from attack by other ions (4) they have large excess of H+ or OH– ions

Last Answer : these give unionised acid or base on reaction with added acid or alkali

Buffer solutions show which one of the following traits: w) absorb acid and base with only small changes in pH x) indefinite stability y) high elasticity z) abnormal density

Description : Buffer solutions show which one of the following traits: w) absorb acid and base with only small changes in pH x) indefinite stability y) high elasticity z) abnormal density

Last Answer : ANSWER: W -- ABSORB ACID AND BASE WITH ONLY SMALL CHANGES IN pH

Out of HCI and CH3COOH, which one is a weak acid and why? Describe an activity to support your answer. -Chemistry

Description : Out of HCI and CH3COOH, which one is a weak acid and why? Describe an activity to support your answer. -Chemistry

Last Answer : Acetic acid ( CH3COOH) is a weaker acid because it does not dissociate completely into its ions in aqueous solution. Activity: Add zinc metal in HCI and CH3COOH respectively. The hydrogen gas will be evolved ... and light red in CH3COOH which shows HCI is a strong acid and CH3COOH is a weak acid.

What is the pH limit of weak acid ?

Description : What is the pH limit of weak acid ?

Last Answer : Weak acid pH range is 3-7 .

What is the color of weak acid ?

Description : What is the color of weak acid ?

Last Answer : The color of weak acid is yellow.

What is weak acid ? What is weak acid ?

Description : What is weak acid ? What is weak acid ?

Last Answer : Acids that are not completely dissolved in water but are partially decomposed, that is, all the acid molecules that do not produce hydrogen ions ( H +) are called weak acids.

Which of the following plots will obtained for a conductomeric titration of strong acid against a weak base?

Description : Which of the following plots will obtained for a conductomeric titration of strong acid against a weak base?

Last Answer : Which of the following plots will obtained for a conductomeric titration of strong acid against a weak base? A. B. C. D.

Is apple a strong or a weak acid?

Description : Is apple a strong or a weak acid?

Last Answer : Need answer

How do Ka values of weak acid and a strong acid compare?

Description : How do Ka values of weak acid and a strong acid compare?

Last Answer : Need answer

Which of the following statements about nucleic acid is most correct? (A) Both pentose nucleic acid and deoxypentose nucleic acid contain the same pyrimidines (B) Both pentose nucleic acid and deoxypentose nucleic acid and deoxypentose nucleic acid Contain the same purines (C) RNA contains cytosine and thymine (D) DNA and RNA are hydrolysed by weak alkali

Description : Which of the following statements about nucleic acid is most correct? (A) Both pentose nucleic acid and deoxypentose nucleic acid contain the same pyrimidines (B) Both pentose nucleic acid and deoxypentose ... (C) RNA contains cytosine and thymine (D) DNA and RNA are hydrolysed by weak alkali

Last Answer : Answer : B

When the electrolyte level of a lead-acid storage battery has decreased due to normal evaporation, the level should be reestablished by adding _____________. A. distilled water only B. sulfuric acid only C. a weak solution of sulfuric acid and distilled water D. a strong solution of sulfuric acid and distilled water

Description : When the electrolyte level of a lead-acid storage battery has decreased due to normal evaporation, the level should be reestablished by adding _____________. A. distilled water only B. sulfuric acid ... of sulfuric acid and distilled water D. a strong solution of sulfuric acid and distilled water

Last Answer : Answer: A

When troubleshooting a lead-acid storage battery, a weak or dead cell is best detected by _________________. A. measuring and comparing all cells' specific gravity B. taking an open circuit voltage test of individual cells C. visually inspecting the electrolyte levels of each cell D. taking each cell's temperature with a calibrated mercury thermometer

Description : When troubleshooting a lead-acid storage battery, a weak or dead cell is best detected by _________________. A. measuring and comparing all cells' specific gravity B. taking an open circuit ... electrolyte levels of each cell D. taking each cell's temperature with a calibrated mercury thermometer

Last Answer : Answer: A

Antacid contain a) Weak acid b) Weak base c) Strong acid d) Strong base

Description : Antacid contain a) Weak acid b) Weak base c) Strong acid d) Strong base

Last Answer : b) Weak base

Electric process as compared to wet process (for the manufacture of phosphoric acid) (A) Can use only high grade phosphate rock (B) Is used less frequently (C) Produces a valuable by-product called gypsum (D) Is weak acid process

Description : Electric process as compared to wet process (for the manufacture of phosphoric acid) (A) Can use only high grade phosphate rock (B) Is used less frequently (C) Produces a valuable by-product called gypsum (D) Is weak acid process

Last Answer : (B) Is used less frequently

Which of the following statements is correct about aniline? (a) is weak acid. (b) diazotizes to benzenediazonium chloride when treated with ice-cold nitrous acid. (c) can be nitrated with concentrated HNO3 to form p-nitroaniline. (d) gives an intense green color with a suspension of bleaching powder in water

Description : Which of the following statements is correct about aniline? (a) is weak acid. (b) diazotizes to benzenediazonium chloride when treated with ice-cold nitrous acid. (c) can be nitrated with ... p-nitroaniline. (d) gives an intense green color with a suspension of bleaching powder in water

Last Answer : diazotizes to benzenediazonium chloride when treated with ice-cold nitrous acid.

Which of the following statements is false about aniline? (a) It is a primary aromatic amine. (b) It is a weak base which forms salts with acids. (c) It liberates nitrogen on treatment with ice-cold nitrous acid. (d) It can be prepared by the reduction of nitrobenzene with tin and HCl

Description : Which of the following statements is false about aniline? (a) It is a primary aromatic amine. (b) It is a weak base which forms salts with acids. (c) It liberates nitrogen on treatment with ice-cold nitrous acid. (d) It can be prepared by the reduction of nitrobenzene with tin and HCl

Last Answer : It liberates nitrogen on treatment with ice-cold nitrous acid

Which one of the following statements about buffers is false? a. They work inside cells. b. They consist of a weak acid and weak base. c. They prevent pH shifts. d. They enhance chemical reactions.

Description : Which one of the following statements about buffers is false? a. They work inside cells. b. They consist of a weak acid and weak base. c. They prevent pH shifts. d. They enhance chemical reactions.

Last Answer : d. They enhance chemical reactions.

The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong (A) Base and strong acid (B) Base and weak acid (C) Acid and weak base (D) None of these

Description : The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong (A) Base and strong acid (B) Base and weak acid (C) Acid and weak base (D) None of these

Last Answer : Option A

Which remedy has vomiting, bilious with anxiety and weak pulse, every month after mensturation, cannot lie on right side or back without instantly producing dark green vomiting. Options: 1) Argentum nitricum 2) Antimonium tart. 3) Crotalus horridus 4) Carbolic acid

Description : Which remedy has vomiting, bilious with anxiety and weak pulse, every month after mensturation, cannot lie on right side or back without instantly producing dark green vomiting. Options: 1) Argentum nitricum 2) Antimonium tart. 3) Crotalus horridus 4) Carbolic acid

Last Answer : Correct Answer: 3) Crotalus horridus