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How much calcium carbonate is in an eggshell? Purpose: Eggshells are composed in part of calcium carbonate. Calcium carbonate reacts with an acid to produce carbon dioxide, water, and a salt. The calcium carbonate in the sample eggshell will be determined by means of reaction with a carefully measured quantity of hydrochloric acid present in excess. The excess acid will be reacted with sodium hydroxide to determine how much acid remains. The amount of acid that reacted with the eggshell and the amount of calcium carbonate in the eggshell itself will be determined using this data. Procedure: The volume of drops from dropping pipettes designated for acid and base was calculated by measuring the volume of 20 drops from each pipette in a graduated cylinder, then calculating the volume per drop. These pipettes were used in all other volume measurements. Eggshell was ground, and a mass of 0.1 gram was transferred to an...

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