A white precipitate was formed when BaCl 2(aq) was added to an aqueous solution of...
CHEMISTRY
WAEC 2022
A white precipitate was formed when BaCl2(aq) was added to an aqueous solution of a salt X. The precipitate dissolved in dilute HCl with rapid effervescence. Salt X is likely to contain
- A. SO42- ions
- B. SO32- ions
- C. NO3- ions
- D. SO32- ions
Correct Answer: D. SO32- ions
Explanation
Effervescence is the formation of gas bubbles in a liquid by a chemical reaction. An example of effervescence is the release of carbon dioxide which bubbles as a gas from the liquid when limestone chips, which are composed of calcium carbonate, are added to dilute hydrochloric acid.
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