Consider the reaction represented by the equation: Ca(OH)2(aq) + CO 2(g) → CaCO3(s) + H 2O(l) in the reaction above, CO 2 acts as

Assessment: WAEC SSCE - Chemistry - 2007 (Objective) Subject: Chemistry

Question 1 Report

Consider the reaction represented by the equation: Ca(OH)2(aq) + CO 2(g) → CaCO3(s) + H 2O(l)
in the reaction above, CO 2 acts as
Answer Details
In the given chemical equation, Ca(OH)2 reacts with CO2 to form CaCO3 and H2O. Carbon dioxide (CO2) is a non-metallic oxide and when it reacts with water, it forms carbonic acid (H2CO3). The equation can be written as CO2 + H2O → H2CO3 Carbonic acid is a weak acid that can donate H+ ions to form HCO3- ions. The HCO3- ions formed then react with Ca2+ ions present in Ca(OH)2 to form CaCO3 and H2O. Thus, CO2 acts as an acidic oxide in the given reaction. Therefore, the answer is "an acidic oxide".
Read lesson note on Acids, Bases And Salts (JAMB)
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