In the qualitative analysis scheme, magnesium and nickel precipitate from solution upon the addition of sodium...

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Chemistry

In the qualitative analysis scheme, magnesium and nickelprecipitate from solution upon the addition of sodium hydroxide.Once separated from the remaining cations by filtration ordecanting, the solid mixture is acidified and warmed to dissolvemagnesium and nickel cations back into solution. Adding ammoniacreates a buffer solution. (Remember, HCl and NH₃ makesfor NH₄⁺ cation.) The buffered solutionshould just be basic (say, pH = 8). Adding sodium hydrogenphosphate (Na₂HPO₄) precipitates magnesium asMgNH₄PO₄ (Ksp = 3 x 10^-13).
a)Write the dissociation equation andcorresponding Ksp expression
b)Calculate the molar solubility ofthe compound

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3.9 Ratings (722 Votes)

Adding ammonia creates a buffer solution Remember HCl and NH3 makes for NH4 cation The buffered solution should just be basic say pH 8 Ammonia See Answer

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