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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 makesfor NH4+ cation.) The buffered solutionshould just be basic (say, pH = 8). Adding sodium hydrogenphosphate (Na2HPO4) precipitates magnesium asMgNH4PO4 (Ksp = 3 x10-13).

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 ofMgNH4PO4 in a solution with pH of8.

Answer & Explanation Solved by verified expert
4.2 Ratings (833 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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