A 4.965-g soil sample was dissolved to give 0.500 L of solution. A 100.0-mL aliq

Question

A 4.965-g soil sample was dissolved to give 0.500 L of solution. A 100.0-mL aliquot was acidified and excess sodium tetraphenylborate (NaB(C6H5)4) was added to precipitate both K and NH4 ions completely. The resulting precipitate amounted to 0.257 g. The remaining 400.0-mL aliquot of the original solution was made alkaline and heated to remove all of the NH4+. The resulting solution was then acidified and excess sodium tetraphenylborate was added to give 0.251 g of precipitate. Assume that all potassium in the soil is present as K2CO3, and all ammonium is present as NH4Cl. Find the mass percentages of NH4Cl and K2CO3 in the original solid.

B(C6H5)4

Explanation / Answer

want to determine the ammonium content using gravimetric analysis with sodium tetraphenylborate, Na B(C6H5)4

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