Define pH of solution. What is scale for it.
pH of solution: It is defined as the negative logarithm of hydrogen ion concentration.
pH= - log[H+ ]
Scale: It is a logarithmic scale ranging from 0 to 14 used to measure the concentration of hydrogen ion in a solution. Water has a pH of 7, acidic solution has a low pH value (0-7) and basic solution has a high pH value(7-14).