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.
ScienceClass 9CBSEAnswered 27 Mar 2026
Answer
Soln:
1 mole of calcium chloride = 111g
Therefore 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
=3.6132 × 1024 ions
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