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

CaCl2 (aq) → Ca2+ (aq) + 2Cl– (aq) 

Calculate the number of ions obtained from CaCl2 when 222 g of it is dissolved in water. 

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1 Answer

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1 mole of calcium chloride = 111g 

∴ 222g of 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 give 3×2=6 moles of ions. 

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

                              = 6 × 6.022 ×1023 

                             = 36.132 ×1023 

                             = 3.6 132 ×1024 ions

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