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... Worked Solutions Chapter 11 Question 5 What is the concentration in grams per litre of (a) a 0.1 M HCl solution (b) a 0.05 M Na2CO3 solution (c) a 0.05 M NaOH solution (d) a 0.01 M KOH solution (e) a 0.2 M HNO3 solution? Answer: (a) Molar mass of HCl = 36.5 g mol-1 0.1M HCl solution contains 0.1 moles = 0.1 X 36.5 g in 1 litre Concentration of HCl solution = 3.65 g l-1 (b) Molar mass of Na2CO3 = 106 g mol-1 0.05M Na2CO3 solution contains 0.05 moles = 0.05 X 106 g in 1 litre Concentration of Na2CO3 solution = 5.3 g l-1 (c) Molar mass of NaOH = 40 g mol-1 0.05M NaOH solution contains 0.05 moles = 0.05 X 40 g in 1 litre Concentration of NaOH solution = 2 g l-1 (d) Molar mass of KOH = 56 g mol-1 0.01M KOH solution contains 0.01 moles = 0.01 X 56 g in 1 litre
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