Question

pH of a buffer solution varies with_________.

Answer 1

Buffer solution:

• The aqueous solution of a mixture of a weak acid and its conjugate base and vice-versa is termed a buffer solution.
• pH of buffer solution varies with the equilibrium constant of a weak acid and the ratio of weak base to weak acid in the solution.
• The equilibrium constant of an acid determines the dissociation acid and its conjugate base.
• Different acids have a different equilibrium constant so the amount of dissociation of ${\mathrm{H}}^{+}$ ion varies.
• The more ${\mathrm{H}}^{+}$ ions in the solution the more acidic the buffer will be and so lower will be the pH.
• The ratio of acid to its conjugate base also affects the solution of the buffer.
• If the ratio of conjugate base is higher then more number of ${\mathrm{OH}}^{-}$ will be present in the buffer solution. so the solution will be basic and pH will be higher.

So, pH of a buffer solution varies with type of buffer.