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Chapter 27: Q5P (page 767)

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

Short Answer

Expert verified

The Ionic precipitates are washed with electrolyte solution instead of pure water because it keeps the electric double layer preserved.

Step by step solution

01

DefinitAion

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

Ionic precipitates

Washing the ionic precipitates with water would lead to loss of charged particles and product would be broken up (this is also leads to the loss of product).

03

Peptization

Therefore, washing the ionic precipitate with electrolyte keeps the electric double layer preserved in order to prevent peptization.

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Most popular questions from this chapter

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?

A 0.649-g sample containing only K2SO4(FM174.27)and (NH4)2SO4(FM132.14)was dissolved in water and treated withBa(NO3)2to precipitate allSO4-2asBaSO4(FM233.39). Find the weight percent ofK2SO4in the sample if 0.977 g of precipitate was formed.

Explain what is done in thermogravimetric analysis.

Thermogravimetric analysis and propagation of error. 16 Crystals of deuteratedpotassium dihydrogen phosphate,K(DxH1-x)2PO4are used in optics as a light valve, as a light deflector, and for frequency doubling of lasers. The optical properties are sensitive to the fraction of deuterium in the material. A publication states that deuterium content can be determined by measuring the mass lost by dehydration of the crystal after slow heating to450°C in a Pt crucible underN2

(a) Letα be the mass of product divided by the mass of reactant:

α=massofKPO3massofK(DxH1-x)2PO4

Show that the coefficient xin K(DxH1-x)2PO4is related to αby the equation

x=58.6670α-67.6183

What would be the value ofαif starting material were 100% deuterated?

(b) One crystal measured in triplicate gave an average value ofα=0.85677.Find x for this crystal.

(c) From equation B.1 in Appendix B, show that the uncertainty inx(ex) is related to the uncertainty inα(eα)by the equation

ex=58.6670eαα2

(d) The uncertainty in deuterium: hydrogen stoichiometry ise_{x}The authors estimate that their uncertainty inα isex=0.0001. Fromeα computee_{x}. Write the stoichiometry in the formx±ex Ifexwere 0.001 (which is perfectly reasonable), what wouldexbe?

A 6.234-mg sample produced 12.123 mgCO2and 2.529mg ofH2O.

Find the wt%of C and H in the sample.
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