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
Description : A 0.22 M solution of lactic acid (pKa 3.9) was found to contain 0.20 M in the dissociated form and 0.02 M undissociated form, the pH of the solution is (A) 2.9 (B) 3.3 (C) 4.9 (D) 5.4
Last Answer : Answer : C
Description : Which of the following is correct for an amino acid solution when it is in the acidic form? (a) pH > pKa (b) pH < pKa (c) zwitterionic (d) pH = 7
Last Answer : pH < pKa
Description : The stronger the acid __________. (a) the less stable its conjugate base (b) the larger the pKa (c) the weaker its conjugate base (d) the larger the pH
Last Answer : the weaker its conjugate base
Description : Which statement is correct about acid-base chemistry? (a) the larger the Ka, the stronger the acid (b) a small pKa correspond to a large Ka (c) the smaller the pKa, the stronger the acid (d) all of the above
Last Answer : all of the above
Description : What is the pka of sodium dehydroacetate?
Last Answer : What is the answer ?
Description : pKa of dihydrogen phosphate is (A) 5.8 (B) 6.1 (C) 6.8 (D) 7.1
Description : Very strongly acidic cations have pKa values -------. a.between11.5 – 14.0 b. between6.0-11.5 c. between1.0-6.0 d. below -4.0
Last Answer : d. below -4.0
Description : The most important factor which governs diffusion of drugs across capillaries other than those in the brain is: A. Blood flow through the capillary B. Lipid solubility of the drug C. pKa value of the drug D. pH of the medium
Last Answer : A. Blood flow through the capillary