Chapter 27: Q3 P (page 767)
Why is high relative supersaturation undesirable in a gravimetric precipitation?
The high relative supersaturation undesirable in a gravimetric precipitation due to the fast nucleation- suspension of colloids would be higher would isn’t desirable.
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Consider a mixture of the two solids,
, in an unknown ratio. (The notation means that a crystal is formed with two water molecules for each ) When the unknown is heated to for 1h, the water of crystallization is driven off:
A sample originally weighing 1.7839 g weighed 1.5623 g after heating. Calculate the weight percent Ba,K and Cl ofin the original sample.
Write a balanced equation for the combustion of benzoic acid,, to give and . How many milligrams of and of will be produced by the combustion of 4.635mgof benzoic acid?
State four desirable properties of a gravimetric precipitate.
Combustion analysis of a compound known to contain justC,H,N, and Odemonstrated that it is 46.21wt%C,9.02wt% H, 13.74wt N and, by difference, 100 - 46.21 - 9.02 -13.74 = 31.03% O. This means that of unknown would contain46.21gof C,9.02g ofH, and so on. Find the atomic ratio C : H : N : Oand express it as the lowest reasonable integer ratio.
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’s 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?
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