Which alkali metal carbonate? imagine you are an analytical chemist and have received a sample of a pure alkali metal carbonate from a newly discovered deposit. your task is to determine which alkali metal carbonate is present in the sample. you will determine an experimental molar mass for the alkali metal in the carbonate and, from that result, you will determine which alkali metal is present. to identify your unknown, you will employ the law of conservation of mass. this law states that in a chemical reaction the total mass of the reactants must equal the total mass of products. alkali metal carbonates (x2co3) react with hcl according to the following equation (x is meant to represent the unknown alkali metal cation)
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