Prepare 50 wt% aqueous NaOH solution in advance and allow the Na 2 CO 3 precipitate to
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Prepare 50 wt% aqueous NaOH solution in advance and allow the Na2CO3 precipitate to settle overnight. (Na2CO3 is insoluble in this solution.) Store the solution in a tightly sealed polyethylene bottle and avoid disturbing the precipitate when supernate is taken. The density is close to 1.50 g of solution per milliliter.
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