Which calcium compound is not appreciably more soluble in 0.1 M hydrochloric acid than it is in pure water?

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Limestone, ${CaCO}_{3}$

Slaked lime, $Ca (OH)_{2}$

Hydroxyapatite, ${Ca}_{5} (OH) {({PO}_{4})}_{3}$

Gypsum, ${CaSO}_{4} \cdot 2 H_{2} O$

answer is C.

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Detailed Solution

Gypsum, ${CaSO}_{4} \cdot 2 H_{2} O$ is not appreciably more soluble in 0.1 M hydrochloric acid than it is in pure water. Because gypsum is only slightly water-soluble, gypsum-containing sample material dissolves only slightly when mixed with distilled water.

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