If M2+ is Ca2+ and Z2- is CO32-, would you raise or lower the pH if...

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If M2+ is Ca2+ and Z2- is CO32-, would you raise or lower the pH if...

If M2+ is Ca2+ and Z2- is CO32-, would you raise or lower the pH if you wanted to make a precipitate? Why?

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Answer 1

Answer #1

Answer :

We have to raise the pH (basic conditions) to make more precipitate of CaCO3.

Explanation :

Solubility of CaCO3 increase in acidic conditions because of formation of CO2. Reaction is :

CaCO3 (s) + 2 H+ (aq) ---> Ca2+ (aq) + CO2 (g) + H2O (l)

So in acidic conditions, CaCO3 will dissolve and no precipitate formation. So for precipitate formation we have to reverse the reaction. If we add base then it will consume all H+ and reaction will proceed in backward direction and more and more of precipitate of CaCO3 will produced.

Note : low pH ( 0-7) = acidic conditions

High pH ( 7-14) = basic conditions

At pH 7 = neutral conditions

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Answer 2

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