WAEC Chemistry 2011 Objective — Question 23
Question 23 of 50 from the West African Examinations Council (WAEC) Chemistry 2011 Objective paper, with the correct answer and a full explanation.
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Bubbling excess carbon (IV) oxide into calcium hydroxide solution results in the formation of
- A. A. CaCO3
- B. B. CaO
- C. C. Ca(HCO3)2Correct
- D. D. H2CO3
Explanation
A small amount of CO2 bubbled into calcium hydroxide forms a white precipitate of CaCO3, but if the carbon (IV) oxide is in excess, Ca(HCO3)2 is formed instead: 2CO2(g)+Ca(OH)2(aq) → Ca(HCO3)2(aq).
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