Neco 2024 Chemistry Question 10
Practice objective / multiple choice question 10 from the 2024 Neco Chemistry examination.
A 0.250 g sample of a solid mixture of CaCO3 and MgCO3 is dissolved in excess 0.1500 M HCl (25.00 mL). The excess acid is back‑titrated with 0.1000 M NaOH, requiring 12.50 mL of NaOH. After neutralisation, the solution is treated with excess ammonium oxalate, precipitating calcium oxalate monohydrate of mass 0.150 g. Determine the percentage by mass of CaCO3 in the original sample. Give your answer to one decimal place.
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About This Question
This is Neco 2024 Chemistry Question 10. It is one of the objective questions from the 2024 Neco Chemistry examination.
Difficulty level: Hard .
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