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Chapter 27: Q4P (page 767)

What measures can be taken to decrease the relative supersaturation during a precipitation?

Short Answer

Expert verified

The measures to be taken to decrease the relative supersaturation during a precipitation

  1. Slow addition
  2. Homogenous solution
  3. Dilute reagents
  4. Increased temperature

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

Measures to be taken to decrease the Supersaturation

1. Slow addition of precipitating agent and mixing during addition

2. Precipitate forms homogenous solution – precipitating agent in this case is synthesized in the solution and isn’t added mechanically.

3. Precipitating using dilute reagents

4. Increased temperature – solubility is increased.

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Most popular questions from this chapter

A mixture containing only Al2O3(FM 101.96) andFe2O3(FM 159.69) weighs 2.019 g. When heated under a stream ofH2Al2O3is unchanged, butisFe2O3 converted into metallic Fe plusH2O(g)If the residue weighs 1.774 g, what is the weight percent ofFe2O3in the original mixture?

A solid mixture weighing 0.5485 gcontained only ferrous ammonium sulfate hexahydrate and ferrous chloride hexahydrate. The sample was dissolved in 1MH2SO4 , oxidized to Fe3+ with H2O2, and precipitated with cupferron. The ferric cupferron complex was ignited to produce 0.1678 gof ferric oxide, Fe2O3(FM 159.69). Calculate the weight percent of Clin the original sample.

We now examine some examples that illustrate how to relate the mass of a gravimetric precipitate to the quantity of the original analyte. The general approach is to relate the moles of product to the moles of reactant.

An alloy contains~2.0 wt% Ni. What volume of 0.83 wt% DMG should be used to provide a 50%excess of DMG for the analysis of 1.8 g of steel? What mass ofNi(DMG)2 precipitate is expected?

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.
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