Addition of sodium hydroxide solution to a weak acid (HA) results in a buffer of pH 6. If ionization constant of HA is 10 - 5 , the ratio of salt to acid concentration in the buffer solution will be:

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p H = p k a + l o g S a l t A c i d ( ∵ [Salt]=[Anion] ) ⇒ 6 = 5 + log ⁡ S a l t A c i d ⇒ 1 = log ⁡ S a l t A c i d ⇒ l o g 10 = log ⁡ S a l t A c i d S a l t a c i d = 10 1

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