Question 1 (a) An unknown compound, X, has the molecular formula C9H8O4. A student used a back titration to determine the percentage purity in a sample of X. The student reacted 0.200g of X with 30.0 cm³ of 0.1 mol dm-³ sodium hydroxide which was in excess. 1 mole of X reacted with 2 moles of sodium hydroxide. The excess sodium hydroxide required 11.7cm³ 0.1mol dm-³ hydrochloric acid for neutralisation. Deduce the percentage purity of compound X. You must show all steps in your answer. (b) The volume of 30.0 cm³ of sodium hydroxide was measured using a Class A burette. These measurements have a precision of ±0.1 cm³. Calculate the percentage uncertainty and absolute uncertainty in the volume of sodium hydroxide.

Question 1 (a) An unknown compound, X, has the molecular formula C9H8O4. A student used a back titration to determine the percentage purity in a sample of X. The student reacted 0.200g of X with 30.0 cm³ of 0.1 mol dm-³ sodium hydroxide which was in excess. 1 mole of X reacted with 2 moles of sodium hydroxide. The excess sodium hydroxide required 11.7cm³ 0.1mol dm-³ hydrochloric acid for neutralisation. Deduce the percentage purity of compound X. You must show all steps in your answer. (b) The volume of 30.0 cm³ of sodium hydroxide was measured using a Class A burette. These measurements have a precision of ±0.1 cm³. Calculate the percentage uncertainty and absolute uncertainty in the volume of sodium hydroxide.

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter4: Reactions In Aqueous Solution

Section: Chapter Questions

Problem 37QAP: An artificial fruit beverage contains 12.0 g of tartaric acid, H2C4H4O6, to achieve tartness. It is...

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