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Chapter 27: Q2 P (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

 Step 2: Desirable properties of gravimetric precipitate

  1. Easy filterability - Particles should be smaller considering the size
  2. Insolubility – needed in order to get high yield of precipitate
  3. High purity – 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

The thermogravimetric trace on the next page shows mass loss by Y2(OH)5Cl⋅xH2O upon heating. In the first step, waters of hydration are lost to give ~8.1% mass loss. After a decomposition step,19.2% of the original mass is lost. Finally, the composition stabilizes atY2O3 above 8009C.

(a) Find x in the formula Y2(OH)5Cl⋅xH2O.Because the 8.1% mass loss is not accurately defined in the experiment, use the 31.8% total mass loss for your calculation.

(b) Suggest a formula for the material remaining at the 19.2% plateau. Be sure that the charges of all ions in your formula sum to 0 . The cation is Y3+.

A method to measure soluble organic carbon in seawater includes oxidation of the organic materials to CO2 with K2S2O8, followed by gravimetric determination of the CO2 trapped by a column 0f Ascarite. A water sample weighing 6.234 g produced 2.378 mg of CO2(FM 44.009). Calculate the ppm carbon in the seawater.

Explain how the quartz crystal microbalance at the opening of Chapter 2 measures small masses

1.475-g sample containing NH4Cl(FM53.491),K2CO3(FM 138.21), and inert ingredients was dissolved to give 0.100 L of solution. A 25.0-mL aliquot was acidified and treated with excess sodium tetraphenylborate,Na+B(C6H5)4-, to precipitateK+and

NH4+ions completely:

(C6H5)4B-+K+→(C6H5)4BK(s)FM358.33(C6H5)4B-+NH4+→(C6H5)4BNH4(s)FM337.27

The resulting precipitate amounted to 0.617 g. A fresh 50.0-mL aliquot of the original solution was made alkaline and heated to drive off all theNH3.

NH4++OH-→NH3(g)+H2O

It was then acidified and treated with sodium tetraphenylborate to give 0.554 g of precipitate. Find the weight percent ofNH4ClandK2CO3in the original solid.

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?
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