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The 25°C evaporation of a 100 cm $^{3}$ solution of K\(...

The 25°C evaporation of a 100 cm $^{3}$ solution of K $_{2}$ CO $_{3}$ to dryness gave 14g of the salt. What is the solubility of K $_{2}$ CO $_{3}$ at 25°C? [K $_{2}$ CO $_{3}$ = 138]

A.

0.01 mol dm $^{-3}$

B.

0.101 mol dm $^{-3}$

C.

1.01 mol dm $^{-3}$

D.

10.0 mol dm $^{-3}$

View answer & explanation

Correct answer is C

solubility( in mol/dm^3) = $\frac{ mass of salt}{ Molar Mass of salt} = \frac{ 1000cm^3}{ volume of solution in cm^3}$

$\frac{14}{138 } = \frac{ 1000cm^3}{ 100}$

$\frac{14000}{13800} = 1.01 mol/dm^3$

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