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CGP EDU Academic Team
Published on: August 14, 2026
21.2 g sample of impure Na 2 CO 3 is dissolved and reacted with a solution of CaCl 2 , the weight of precipitate of CaCO 3 is 10.0 g. Which of the following statements is/are correct ?
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(a,c) Mw of CaCO 3 = 100, Mw of Na 2 CO 3 = 106
Mw of HNO 3 = 63 g mol –1
Na 2 CO 3 + CaCO 3 
CaCO 3 + 2NaCl
moles of CaCO 3 = 
= 0.1 mol
moles of Na 2 CO 3 = moles of CaCO 3 ≡ 2 × moles of NaCl
Weight of Na 2 CO 3 = 0.1 × 106 = 10.6 g
% purity Na 2 CO 3 = 
= 100 = 50%
wrong
correct
moles of NaCl = 2 × 0.1 = 0.2 mol
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