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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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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?
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?
A 0.050 02-g sample of impure piperazine contained 71.29 wt% piperazine (FM 86.136). How many grams of product (FM 206.240) will be formed when this sample is analyzed by Reaction 27-6?
Finely ground mineral (0.6324g)was dissolved in 25 mLof boiling 4M HCland diluted with containing two drops of methyl red indicator. The solution was heated to of warm solution containing were slowly added to precipitate was added until the indicator changed from red to yellow, showing that the liquid was neutral or slightly basic. After slow cooling for 1 h, the liquid was decanted and the solid transferred to a filter crucible and washed with cold solution five times until no was detected in the filtrate upon addition of solution. The crucible was dried at 1 h and then at in a furnace for 2 h.
FM 40.078 18.5467 g
The mass of the empty crucible was 18.2311 g and the mass of the crucible with was 18.5467 g .
(a) Find the wt% Ca in the mineral.
(b) Why is the unknown solution heated to boiling and the precipitant solution, also heated before slowly mixing the two?
(c) What is the purpose of washing the precipitate with0.1wt%?
(d) What is the purpose of testing the filtrate withsolution?
How many grams ofwere in a sample that produced 1.000 g of
AgBr precipitate (FM 5 187.77)?
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