November 29, 2015

Homework Help: Chemistry

Posted by Sophia on Wednesday, November 10, 2010 at 1:25am.

1.25 g of crushed limestone was added to 50.0 cm3 of 1.00 mol dm-3 hydrochloric acid (an excess). The mixture was left until all bubbling stopped and was then made up carefully to 250 cm3 with pure water. A 25.0 cm3 sample of this was pipetted into a conical flask and some methyl orange indicator was added. Sodium hydroxide solution of concentration 0.100 mol dm-3 was added from a burette. 30.0 cm3 were needed to reach the end-point of the indicator. We can then calculate the percentage of calcium carbonate in the sample. What is the mass percentage of carbonate in the sample? Assume all carbonate is calcium carbonate, what is the mass percentage of the remainder ( or is this assumption not tenable) ?

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