Neco 2019 Chemistry Question 31
Practice objective / multiple choice question 31 from the 2019 Neco Chemistry examination.
A 0.500 g sample of an impure carbonate mixture containing only \( \mathrm{Na_2CO_3} \), \( \mathrm{NaHCO_3} \) and an inert impurity is dissolved in 50.0 mL water. Excess 0.100 M HCl (25.0 mL) is added, and the resulting solution is back‑titrated with 0.100 M NaOH, requiring 12.5 mL to reach the endpoint. Assuming complete reactions, calculate the mass percent of \( \mathrm{Na_2CO_3} \) in the original sample.
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About This Question
This is Neco 2019 Chemistry Question 31. It is one of the objective questions from the 2019 Neco Chemistry examination.
Difficulty level: Hard .
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