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Chapter 27: Q2P (page 767)

State four desirable properties of a gravimetric precipitate.

Short Answer

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The Four desirable properties of gravimetric precipitate

  1. Easy filterability
  2. Insolubility
  3. High purity
  4. Stable and constant composition

Step by step solution

01

Definition

It is an analytical technique that uses a precipitation reaction to separate ions from a solution. The chemical that is added to cause the precipitation is called the precipitant or precipitating agent

02

Desirable properties of gravimetric precipitate

  1. Easy filterability - Particles should be smaller considering the size
  2. Insolubility 鈥� needed in order to get high yield of precipitate
  3. High purity 鈥� less impurities need to be present in sample
  4. Stable and constant composition - necessary in order to obtain accurate weight.

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Most popular questions from this chapter

Why is high relative supersaturation undesirable in a gravimetric precipitation?

Why are many ionic precipitates washed with electrolyte solution instead of pure water?

Write a balanced equation for the combustion of benzoic acid,C6H5CO2H, to giveCO2 and H2O. How many milligrams of and of will be produced by the combustion of 4.635mgof benzoic acid?

What is the difference between combustion and pyrolysis?

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 contained8.00脳103Lof 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,(NH4)3[P(Mo12O40)]12H2OThis substance was dried at110掳Cto remove waters of hydration and heated to400掳Cuntil it reached the constant compositionP2O5脳24MoO3, 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 ofP2O5脳24MoO3(FM3596.46)was produced. This blank determination gives the amount of phosphorus in the starting reagents. TheP2O5脳24MoO3that could have come from the dissolved man is therefore0.3718-0.0331=0.3387g.How much phosphorus was present in the 100.0-mL sample? Is this quantity consistent with a dissolved man?
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