WAEC Chemistry 2010 Theory — Question 41
Question 41 of 46 from the West African Examinations Council (WAEC) Chemistry 2010 Theory paper, with the correct answer and a full explanation.
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7e) By means of balanced chemical equations only, outline the process of manufacture of H2SO4 (i) by contact process (ii) state the function of H2SO4 in each of the following reaction equations.
Model answer
S(s)+O2(g)→SO2(g); 2SO2(g)+O2(g)⇌2SO3(g); SO3(g)+H2SO4(aq)→H2S2O7(l) [oleum]; H2S2O7(l)+H2O(l)→2H2SO4(aq). (ii) In these equations, H2SO4 (as oleum precursor and product) acts as a dehydrating agent and as a precipitating agent depending on the reaction context.
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