Question
An experiment in your laboratory requires exactly 500mL of 0.0200M solution of Na2CO3. You are given solid Na2CO3, distilled water and a 500mL volumetric flask. describe how you would prepare the required solution.
Answers
You want how many moles? M x L = mols = 0.0200 x 0.500 = 0.01 mols.
Then grams = mols Na2CO3 x molar mass Na2CO3 = ?
Weigh out exactly that many grams Na2CO3, transfer quantitatively to a 500 mL volumetric flask, add some distilled water, swirl until all of the solid is dissolved, add more distilled water to the mark on the flask, stopper, mix thoroughly, label.
Then grams = mols Na2CO3 x molar mass Na2CO3 = ?
Weigh out exactly that many grams Na2CO3, transfer quantitatively to a 500 mL volumetric flask, add some distilled water, swirl until all of the solid is dissolved, add more distilled water to the mark on the flask, stopper, mix thoroughly, label.
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