Question

Calculate the molarity of Na2CO3 in the solution prepared by dissolving 5.3 g of it in enough water to form 500 ml of the solution

Answer 1

First you need to know the molecular weight of Na2CO3. It is 106 g/mol. Now, calculate the number of moles is represented by 5 g. This is 5 g/106 g/mol or 0.0472 mol. Now divide by the number of liters to get the concentration or 0.0472 mol/0.2 L = 0.236 mol/L or 0.236 M

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