Question

The compound whose aqueous solution has highest ph is A Nacl B NH4Cl C CH3COONH4 D Na2CO3

Answer 1

D) Na2CO3 has the highest ph.

Answer 2

$Na_2CO_3$ has the highest pH.

Explanation:

a) $NaCl$: This is a salt formed by the reaction of strong base NaOH and strong acid $HCl$. So, this salt is a neutral salt.

$HCl+NaOH\rightarrow NaCl+H_2O$

b. $NH_4Cl$: This is a salt formed by the reaction of weak base $NH_4OH$ and strong acid $HCl$. So, this salt is a acidic salt.

$HCl+NH_4OH\rightarrow NH_4Cl+H_2O$

c. $CH_3COONH_4$: This is a salt formed by the reaction of weak base $NH_4OH$ and weak acid $CH_3COOH$. So, this salt is a neutral salt.

$CH_3COOH+NH_4OH\rightarrow CH_3COONH_4+H_2O$

d. $Na_2CO_3$: This is a salt formed by the reaction of strong base $NaOH$ and weak acid $H_2CO_3$. So, this salt is a basic salt.  Thus has highest pH.

$H_2CO_3+2NaOH\rightarrow Na_2CO_3+2H_2O$

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