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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 makes for NH4+cation.) The buffered solution should just be basic (say, pH = 8).Adding sodium hydrogen phosphate (Na2HPO4) precipitates magnesiumas MgNH4PO4 (Ksp = 3 x 10-13).

a) Write the Ksp expression for the dissociation ofMgNH4PO4.

b) Calculate the molar solubility of the compound in purewater.

c) Calculate the [NH4+] in a pH of 8.

d) Calculate the molar solubility of MgNH4PO4 in a solution withpH of 8.

Answer & Explanation Solved by verified expert
3.9 Ratings (448 Votes)
Adding ammonia creates a buffer solution HCl and NH3 makes for NH4 cation The buffered solution should just be basic pH 8 NH3 NH4    See Answer
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