39. Solution to Chemistry Problem
📂 Chemistry
👤 Derkach
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4. A weighed portion of technical sodium hydrogen carbonate 0.6720 is dissolved in 100 ml of water, 10 ml of a 10% solution of barium chloride and 30 ml of 0.1 M carbonate-free alkali are added to 25 ml of this solution. The excess alkali is titrated with 20.5 ml of a 0.11 M solution of hydrochloric acid with phenolphthalein. Calculate the percentage content of sodium hydrogen carbonate.
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