Neco 2019 Chemistry Question 30
Practice objective / multiple choice question 30 from the 2019 Neco Chemistry examination.
A 0.500 g sample of an impure solid containing calcium carbonate (CaCO₃) is dissolved in excess HCl. Exactly 25.00 mL of 0.2000 M HCl is added. The excess acid is back‑titrated with 0.1000 M Na₂CO₃ solution, requiring 12.35 mL to reach the endpoint. Determine the percent purity of CaCO₃ in the original sample.
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About This Question
This is Neco 2019 Chemistry Question 30. It is one of the objective questions from the 2019 Neco Chemistry examination.
Difficulty level: Hard .
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