Ion exchange resin can replace Ca2 + ions in hard water with H+ ions: RH2+Ca2 + arrow RCa+2H+ 1L of hard water sample after passing through the resin shows pH=2 . What is ppm of Ca2 + ions in water sample? [Atomic weight: Ca=40 ].

Question

Ion exchange resin can replace Ca2 + ions in hard water with H+ ions: RH2+Ca2 + arrow RCa+2H+ 1L of hard water sample after passing through the resin shows pH=2 . What is ppm of Ca2 + ions in water sample? [Atomic weight: Ca=40 ]. (A) 100 (B) 200 (C) 300 (D) 400

Tardigrade Admin · Accepted Answer

[H+]=10- 2M mol of H+=10- 2 mol mol of Ca2 +=(10- 2/2) mol ppm of Ca2 +=((10- 2/2) × 40/1000)× 106=200

Q. Ion exchange resin can replace $C a^{2 +}$ ions in hard water with $H^{+}$ ions :
$R H_{2} + C a^{2 +} \to RC a + 2 H^{+}$
$1 L$ of hard water sample after passing through the resin shows $p H = 2$ . What is ppm of $C a^{2 +}$ ions in water sample? [Atomic weight: $C a = 40$ ].

$100$

$200$

$300$

$400$

$[H^{+}] = 1 0^{- 2} M$
mol of $H^{+} = 1 0^{- 2}$ mol
mol of $C a^{2 +} = \frac{1 0 ^{- 2}}{2}$ mol
ppm of $C a^{2 +} = \frac{\frac{1 0 ^{- 2}}{2} \times 40}{1000} \times 1 0^{6} = 200$

Q. Ion exchange resin can replace Ca2+ ions in hard water with H+ ions : RH2​+Ca2+→RCa+2H+ 1L of hard water sample after passing through the resin shows pH=2 . What is ppm of Ca2+ ions in water sample? [Atomic weight: Ca=40 ].

100

200

300

400