Ncert Exercises & Solutions

7.63 Predict if the solutions of the following salts are neutral, acidic or basic:

NaCl, KBr, NaCN, NH4NO3, NaNO2 and KF

(i) NaCl :

NaCI + H_{2} O \leftrightarrow \underset{Strong base}{NaOH} + \underset{Strong acid}{HCI}

Therefore, its a neutral solution .

(ii) KBr :

KBr + H_{2} O \leftrightarrow \underset{Strong base}{KOH} + \underset{Strong acid}{HBr}

Therefore, it is a neutral solution .

(iii) NaCN :

NaCN + H_{2} O \leftrightarrow \underset{Weak acid}{HCN} + \underset{Strong base}{NaOH}

Therefore, it is a basic solution .

(iv) {NH}_{4} {NO}_{3}

{NH}_{4} {NO}_{3} + H_{2} O \leftrightarrow \underset{Weak base}{{NH}_{4} OH} + \underset{Strong acid}{{HNO}_{3}}

Therefore, it is an acidic solution .

(v) {NaNO}_{2}

{NaNO}_{2} + H_{2} O \leftrightarrow \underset{Strong base}{NaOH} + \underset{Weak acid}{{HNO}_{2}}

Therefore, it is a basic solution .

(vi) KF

KF + H_{2} O \leftrightarrow \underset{Strong base}{KOH} + \underset{Weak acid}{HF}

Therefore, it is a basic solution .