WAEC Chemistry 2018 Objective — Question 27
Question 27 of 50 from the West African Examinations Council (WAEC) Chemistry 2018 Objective paper, with the correct answer and a full explanation.
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Consider the following reaction equations: 2HCl+Ca(OH)₂→CaCl₂+2H₂O. What is the volume of 0.1 moldm⁻³ HCl that would completely neutralize 25cm³ of 0.3 moldm⁻³ Ca(OH)₂?
- A. 150cm³Correct
- B. 75cm³
- C. 30cm³
- D. 25cm³
Explanation
Using CaVa/na = CbVb/nb with na=2 (HCl), nb=1 (Ca(OH)₂): Va = (0.3×25×2)/(0.1×1) = 150cm³.
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