NCERT Exemplar XIX — task. Science CBSE, Class 9.

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Write brief answers to the following question:

Calcium chloride when dissolved in water dissociates into its ions according to the following equation.

$CaCl_2$ (aq) →

$Ca^2{^+}$ (aq) +

$2Cl^-$ (aq)

Calculate the number of ions obtained from

$CaCl_2$ when 222 g of it is dissolved in water.

1 mole of calcium chloride = .

∴ 222 g of

$CaCl_2$ is equivalent to 2 moles of

$CaCl_2$ .

Since 1 formula unit

$CaCl_2$ gives 3 ions, therefore, 1 mol of

$CaCl_2$ will give of ions.

2 moles of

$CaCl_2$ would give 3 × 2 = of ions.

No. of ions = No. of moles of ions × Avogadro number.

$6$ × ×

$10^2{^3}$ .

$36.132$ ×

$10^2{^3}$ .

= ×

$10^2{^4}$ ions.

Did you find an error?

40. NCERT Exemplar XIX