Neco 2018 Chemistry Question 3
Practice objective / multiple choice question 3 from the 2018 Neco Chemistry examination.
A 1.250\,g sample of impure sodium carbonate (Na\(_2\)CO\(_3\)) is dissolved in water and 30.00\,mL of 0.100\,M HCl is added in excess. The excess acid is then back‑titrated with 0.0800\,M NaOH, requiring 15.00\,mL to reach the endpoint. (a) Determine the mass percent purity of Na\(_2\)CO\(_3\) in the sample. (b) How many millilitres of 0.0500\,M HCl are needed to completely neutralise 0.500\,g of pure Na\(_2\)CO\(_3\)?
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About This Question
This is Neco 2018 Chemistry Question 3. It is one of the objective questions from the 2018 Neco Chemistry examination.
Difficulty level: Hard .
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