Question

This is from a "effect of pH on the solubility of Ca(OH)2" lab: If excess Ca(NO3)2 were present, what effect would it have on the solubility of Ca9OH)2?
also,
in a "effect of comlex ion formaiton on the solubility of NiCO3" lab": If HCl(aq) were added to the NiCo3 precipitate, rather than NH3 (aq), what effect would it have on the solubility? write a balanced ionic equation for the reaction of HCl 9aq) with NiCO3(s).
Ca(OH)2 is less soluble in Ca(NO3)2 that with no Ca(NO3)2.
NiCO3 reacts with HCl to produce CO2 and H2O.
NiCO3 + 2HCl ==> H2O + CO2 + NiCl2
That's the molecular equation. You can convert that to an ionic equation.

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