Neco 2023 Chemistry Question 21
Practice objective / multiple choice question 21 from the 2023 Neco Chemistry examination.
A 0.500 g sample of a solid mixture containing only sodium carbonate (\( \mathrm{Na_2CO_3} \)) and sodium bicarbonate (\( \mathrm{NaHCO_3} \)) is dissolved in water and titrated with 0.100 M HCl. Using phenolphthalein, the first endpoint is reached after 28.0 mL of acid has been added. After adding methyl orange, the second endpoint is reached at a total volume of 52.0 mL of acid. Calculate the mass percent purity of \( \mathrm{Na_2CO_3} \) in the sample.
Answer Options
About This Question
This is Neco 2023 Chemistry Question 21. It is one of the objective questions from the 2023 Neco Chemistry examination.
Difficulty level: Hard .
Master the Exam!
You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.