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A solution is saturated with CaCO3 and Na2CO3 is added to solution. Which of the following...

A solution is saturated with CaCO3 and Na2CO3 is added to solution. Which of the following statements is true?

a. The carbonate concentration is decreased so less calcium is needed to precipitate carbonate.

b. The carbonate concentration is increased so more calcium is needed to precipitate carbonate.

c. The carbonate concentration is increased so less calcium is needed to precipitate carbonate.

d. The carbonate concentration is decreased so more calcium is needed to precipitate carbonate.

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Answer #1

we know that -

CaCl2 + Na2CO3 → CaCO3 + 2NaCl

so when an solution is saturated with CaCO3 then after it by dissoving Na2CO3 again gives more CO3^-2 ions .

but since the solution is already saturated so it might happen that Na2CO3 does not break into its ions.

but in the given options we only have the choice to break the Na2CO3 into its ions .

so concentration of the CO3^-2 ions will also increase in the solution.

and then more calcium is needed to precipitate the carbonate ions

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