Viết phương trình bảo toàn proton của

H2S; H2SO3; HNO2; CH3NH3

Đáp án:

+ $H_2S$:

$H_2S\rightleftharpoons H^++HS^-\quad K_{a_1}$ 

$HS^-\rightleftharpoons H^++S^{2-}\quad K_{a_2}$ 

$H_2O\rightleftharpoons H^++OH^-\quad K_W$ 

Bảo toàn proton:

$[H^+]=[HS^-]+[S^{2-}]+[OH^-]$ 

+ $H_2SO_3$:

$H_2SO_3\rightleftharpoons H^++HSO_3^-\quad K_{a_1}$ 

$HSO_3^-\rightleftharpoons H^++SO_3^{2-}\quad K_{a_2}$ 

$H_2O\rightleftharpoons H^++OH^-\quad K_W$ 

Bảo toàn proton:

$[H^+]=[HSO_3^-]+[SO_3^{2-}]+[OH^-]$

+ $HNO_2$:

$HNO_2\rightleftharpoons H^++NO_2^-\quad K_a$ 

$H_2O\rightleftharpoons H^++OH^-\quad K_W$ 

Bảo toàn proton:

$[H^+]=[NO_2^-]+[OH^-]$ 

+ $CH_3NH_2$:

$CH_3NH_2+H_2O\rightleftharpoons CH_3NH_3^++OH^-\quad K_b$ 

$H_2O\rightleftharpoons H^++OH^-\quad K_W$ 

Bảo toàn proton:

$[OH^-]=[CH_3NH_3^+]+[H^+]$