Question

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

CaCl2(aq) - > Ca^2+ (aq) + 2Cl^-
Calculate the number of ions obtained from CaCl2 when 222g of it is dissolved in water. ​

Answer 1

1 mole ->111g CaCl2

∴ 222g CaCl2 is equivalent to 2 moles of CaCl2

since 1 formula unit CaCl2 gives 3 ions, therefore, 1 mol of CaCl2 will give 3 moles of ions

2 moles of CaCl2 would 3 x 2 = 6 moles

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

= 6 x 6.022 x 10^23

= 36.132×10^23

=3.6132×10^24 ions