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Chalk is made out of Calcium Sulphate and it dissolves in weak acids which means it is a weak chemical to acids. So the vinegar wich is a typr of an acid dissolves the chalk with cool foams foaming in the jug or a cup.

because of the acid in the vinegar

EDIT(Dr.J.): Actually, chalk is mostly calcium carbonate, not calcium sulphate. The carbonate reacts with acetic acid (vinegar) to create CO2 and H2O as follows:

CaCO3 + 2CH3COOH ==> Ca(CH3COO)2 + 2H2CO3 ==> 2CO2 + 2H2O

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8y ago

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