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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

Easy filterability
Insolubility
High purity
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

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

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Most popular questions from this chapter

Twenty dietary iron tablets with a total mass of 22.131 g

were ground and mixed thoroughly. Then 2.998 g of the powder were dissolved in ${HNO}_{3}$ and heated to convert all iron into ${Fe}^{3 +}$ Addition of ${NH}_{3}$ precipitated ${Fe}_{2} O_{3} \times {xH}_{2} O$ , which was ignited to give $0.264 {gofFe}_{2} O_{3} (FM 159.69)$ .What is the average mass of ${FeSO}_{4} \times 7 H_{2} O (FM 278.01)$ in each tablet?

Statistics of coprecipitation. 17In Experiment 1,200.0mL of solution containing 10.0mg of ${SO}_{4}^{2 -}$ (from ${Na}_{2} {SO}_{4}$ ) were treated with excess ${Bacl}_{2}$ solution to precipitate ${BaSO}_{4}$ containing some coprecipitated ${Cl}^{-}$ . To find out how much coprecipitated was present, the precipitate was dissolved in 35mL of 98wt% $H_{2} {SO}_{4}$ and boiled to liberate , which was removed by bubbling gas through the $H_{2} {SO}_{4}$ . The HCI/ $N_{2}$ stream was passed into a reagent solution that reacted with to give a color that was measured. Ten replicate trials gave values of 7.8,9.8,7.8,7.8,7.8,7.8,13,7,12.7,13.7, and 12.7. Experiment 2 was identical to the first one, except that the mL solution also contained of from ). Ten replicate trials gave 7.8,10,8,8.8,7.8,6.9, 8.8, 15.7 , 12.7 , 13.7and $14.7 {μmolCl}^{-}$ .

(a) Find the mean, standard deviation, and 95% confidence interval for ${Cl}^{-}$ in each experiment.

(b) Is there a significant difference between the two experiments? What does your answer mean?

(c) If there were no coprecipitate, what mass of ${BaSO}_{4}$ (FM 233.39) would be expected?

(d) If the coprecipitate is (FM 208.23), what is the average mass of precipitate $({BaSO}_{4} + {BaCl}_{2})$ in Experiment 1. By what percentage is the mass greater than the mass in part (c)?

Marie Curie dissolved 0.091 92 g of RaCl₂ and treated it with excess AgNO₃to precipitate 0.088 90 g of AgCl. In her time (1900), the atomic mass of Ag was known to be 107.8 and that of Cl

was 35.4. From these values, find the atomic mass of Ra that Marie Curie would have calculated.

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

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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