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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

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

Step 2: 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

A 0.649-g sample containing only $K_{2} {SO}_{4} (FM 174.27)$ and $({NH}_{4})_{2} {SO}_{4} (FM 132.14)$ was dissolved in water and treated with $Ba ({NO}_{3})_{2}$ to precipitate all ${SO}_{4}^{- 2} {asBaSO}_{4} (FM 233.39)$ . Find the weight percent of $K_{2} {SO}_{4}$ in the sample if 0.977 g of precipitate was formed.

A mixture containing only ${Al}_{2} O_{3}$ (FM 101.96) and ${Fe}_{2} O_{3}$ (FM 159.69) weighs 2.019 g. When heated under a stream of $H_{2} {Al}_{2} O_{3}$ is unchanged, butis ${Fe}_{2} O_{3}$ converted into metallic Fe plus $H_{2} O (g)$ If the residue weighs 1.774 g, what is the weight percent of ${Fe}_{2} O_{3}$ in the original mixture?

An organic compound with a formula mass of 417g/molwas analyzed for ethoxyl $({CH}_{y} {CH}_{2} O -)$ groups by the reactions

${ROCH}_{2} {CH}_{3} + HI \to ROH + {CH}_{3} {CH}_{2} I {CH}_{3} {CH}_{2} I + {Ag}^{+} + {OH}^{-} \to AgI (s) + {CH}_{3} {CH}_{2} OH$

A 25.42-mg sample of compound produced How many ethoxyl groups are there in each molecule?

A mixture weighing 7.290mgcontained only cyclohexane, $C_{6} H_{12}$ (FM 84.159), and oxirane, $C_{2} H_{4} O$ (FM 44.052). When the mixture was analyzed by combustion analysis, 21.999mg of ${CO}_{2}$ (FM 44.009) were produced. Find the weight percent of oxirane in mixture.

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)?

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