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$^3$ of 0.50m...

200cm $^3$ of 0.50mol/dm $^3$ solution of calcium hydrogen...

200cm $^3$ of 0.50mol/dm $^3$ solution of calcium hydrogen trioxocarbonate (IV) is heated. The maximum weight of solid precipitated is

A.

10g

B.

25g

C.

20g

D.

15g

View answer & explanation

Correct answer is A

Equation: Ca(HCO $_3$ ) $_2$ $\to$ CaCO $_3$ (precipitate) + H $_2$ O + CO $_2$ (in the presence of heat)

V = 200 cm $^3$ = 0.2 dm $^3$

C = 0.5 mol/dm $^3$ = 0.5M

N = CV $\implies$ N = 0.5 $\times$ 0.2

= 0.1 mole

From the equation 1 mole of Ca(HCO $_3$ ) $_2$ gives 100g of CaCO $_3$

(1 mole CaCO $_3$ = 40 + 12 + (3 x 16) = 100g\)

0.1 mole of Ca(HCO $_3$ ) $_2$ gives x g of CaCO $_3$ .

$\frac{1}{0.10} = \frac{100}{x}$

$x = 100 \times 0.10 = 10 g$

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