The molecular formula of a commercial resin used for exchanging ions in water softening is C8H7SO3Na (molecular weight = 206). What would be the maximum uptake of Ca2+ ions by the resin when expressed in mole per gram resin

Question

The molecular formula of a commercial resin used for exchanging ions in water softening is C8H7SO3Na (molecular weight = 206). What would be the maximum uptake of Ca2+ ions by the resin when expressed in mole per gram resin (A) (1/103) (B) (1/206) (C) (2/309) (D) (1/412)

Tardigrade Admin · Accepted Answer

underset2 textmole2 C 8 H 7 SO 3 Na + underset1 textmoleCa 7+ longrightarrow ( C 8 H 7 SO 3)2 Ca 2 × 206 gm take 1 mole of Ca 2+ ∴ 1 gm takes (1/412) mole of Ca 2+.

Q. The molecular formula of a commercial resin used for exchanging ions in water softening is $C_{8} H_{7} S O_{3} N a$ (molecular weight = $206$ ). What would be the maximum uptake of $C a^{2 +}$ ions by the resin when expressed in mole per gram resin

$\frac{1}{103}$

$\frac{1}{206}$

$\frac{2}{309}$

$\frac{1}{412}$

$2 mole 2 C_{8} H_{7} S O_{3} N a + 1 mole C a^{7 +} ⟶ (C_{8} H_{7} S O_{3})_{2} C a$

$2 \times 206 g m$ take $1$ mole of $C a^{2 +}$

$∴ 1 g m$ takes $\frac{1}{412}$ mole of $C a^{2 +}$ .

Q. The molecular formula of a commercial resin used for exchanging ions in water softening is C8​H7​SO3​Na (molecular weight = 206). What would be the maximum uptake of Ca2+ ions by the resin when expressed in mole per gram resin

1031​

2061​

3092​

4121​