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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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7y ago
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Wiki User

13y ago

It acually matters on how big the chalk is. If it's small, it will erode away slowly. Ask again with a measurment next time.

add. But your blackboard chalk may not dissolve at all, for it is possibly made of CaSO4, not CaCO3.

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Wiki User

12y ago

Only completely in lemon juice, a tiny bit in vinegar, and not at all in water.

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Wiki User

13y ago

Chalk is made of calcium carbonate, meaning it eventually will dissolve in vinegar.

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Wiki User

11y ago

Yes chalk does dissolve in vinegar

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Wiki User

11y ago

because in most liquid it want dissolve

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Saniktiar Basaiawmoi...

Lvl 2
11mo ago

Yes

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Wiki User

14y ago

No

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Q: Why does chalk dissolve in certain liquids?
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