Chemistry

Chemistry

Problem

The removal of calcium carbonate scale from glassware with dilute acid proceeds through the following sequence: Step 1: Ca²⁺(aq) + CO₃²⁻(aq) → CaCO₃(s) Step 2: CaCO₃(s) + 2 H⁺(aq) → Ca²⁺(aq) + H₂O(l) + CO₂(g) Which of the following is the overall net ionic equation for the two-step process? a) Ca2+(aq)+CO32−(aq)+2 H+(aq)→Ca2+(aq)+H2O(l)+CO2(g)Ca^{2+}(aq)+CO_{3}^{2-}(aq)+2\,H^{+}(aq)\rightarrow Ca^{2+}(aq)+H_{2}O(l)+CO_{2}(g) b) CO32−(aq)+2 H+(aq)→H2O(l)+CO2(g)CO_{3}^{2-}(aq)+2\,H^{+}(aq)\rightarrow H_{2}O(l)+CO_{2}(g) c) CaCO3(s)+2 H+(aq)→Ca2+(aq)+H2O(l)+CO2(g)CaCO_{3}(s)+2\,H^{+}(aq)\rightarrow Ca^{2+}(aq)+H_{2}O(l)+CO_{2}(g) d) CO32−(aq)+2 H+(aq)→CO2(g)CO_{3}^{2-}(aq)+2\,H^{+}(aq)\rightarrow CO_{2}(g)

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