Neco 2021 Chemistry Question 45
Practice objective / multiple choice question 45 from the 2021 Neco Chemistry examination.
A 0.500 g sample of impure calcium carbonate (CaCO_{3}) is treated with 100.0 mL of 0.200 M HCl. After the reaction, the excess HCl is back‑titrated with 0.150 M NaOH using phenolphthalein as indicator, requiring 30.0 mL of NaOH to reach the endpoint. (Reaction: CaCO_{3} + 2 HCl \rightarrow CaCl_{2} + CO_{2} + H_{2}O.) Determine the percent purity of the calcium carbonate sample.
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About This Question
This is Neco 2021 Chemistry Question 45. It is one of the objective questions from the 2021 Neco Chemistry examination.
Difficulty level: Hard .
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