H+ ion Concentration of water doesn't change by adding - a. CH3COONa b. NaNO3 c. NaCN d. Na2CO3. Which one is the correct option?

1 Answer
anor277
Feb 26, 2018

#"Option b...."#

Explanation:

Cyanide, carbonate, and acetate ions are ALL the conjugate bases of weak to moderate acids...and thus these anions compete somewhat for the proton....

#A^(-) + H_2O(l) rightleftharpoons HA(aq) + HO^-#

On the other hand, nitrate ion is the conjugate base of a reasonably strong acid, i.e. nitric acid, #HNO_3#...the nitrate anion thus does not effect water hydrolysis...

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