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Chapter 27: Q6P (page 767)
Why is it less desirable to wash AgCl precipitate with aqueous NaNO3 than with HNO3 solution?
The AgCI precipitate would be more desirable than with
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Why are many ionic precipitates washed with electrolyte solution instead of pure water?
A 50.00-mL solution containingwas treated with excess AgNo3 to precipitate 0.2146 g of AgBr (FM 187.772). What was the molarity of NaBr in the solution?
Man in the vat problem.15 Long ago, a workman at a dye factory fell into a vat containing hot, concentrated sulfuric and nitric acids. He dissolved completely! Because nobody witnessed the accident, it was necessary to prove that he fell in so that the man鈥檚 wife could collect his insurance money. The man weighed 70 kg, and a human body contains |6.3 parts per thousand (mg/g) phosphorus. The acid in the vat was analyzed for phosphorus to see whether it contained a dissolved human.
(a) The vat containedof liquid, and a 100.0-mL sample was analyzed. If the man did fall into the vat, what is the expected quantity of phosphorus in 100.0 mL?
(b) The 100.0-mL sample was treated with a molybdate reagent that precipitated ammonium phosphomolybdate,This substance was dried atto remove waters of hydration and heated tountil it reached the constant composition, which weighed 0.371 8 g. When a fresh mixture of the same acids (not from the vat) was treated in the same manner, 0.033 1 g ofwas produced. This blank determination gives the amount of phosphorus in the starting reagents. Thethat could have come from the dissolved man is therefore.How much phosphorus was present in the 100.0-mL sample? Is this quantity consistent with a dissolved man?
1.475-g sample containing (FM 138.21), and inert ingredients was dissolved to give 0.100 L of solution. A 25.0-mL aliquot was acidified and treated with excess sodium tetraphenylborate,, to precipitateand
ions completely:
The resulting precipitate amounted to 0.617 g. A fresh 50.0-mL aliquot of the original solution was made alkaline and heated to drive off all the
It was then acidified and treated with sodium tetraphenylborate to give 0.554 g of precipitate. Find the weight percent ofandin the original solid.
Twenty dietary iron tablets with a total mass of 22.131 g
were ground and mixed thoroughly. Then 2.998 g of the powder were dissolved inand heated to convert all iron intoAddition ofprecipitated, which was ignited to give.What is the average mass ofin each tablet?
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