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Chapter 27: Q7P (page 767)
Why would a reprecipitation be employed in a gravimetric analysis?
The reprecipitation method in the gravimetric analysis is used for reducing the level of impurities.
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Write a balanced equation for the combustion of benzoic acid,, to give and . How many milligrams of and of will be produced by the combustion of 4.635mgof benzoic acid?
What is the purpose of the and Cu in Figure 27-8?
1.475-g sample containing (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,, to precipitateand
ions completely:
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 the
It was then acidified and treated with sodium tetraphenylborate to give 0.554 g of precipitate. Find the weight percent ofandin the original solid.
Why are many ionic precipitates washed with electrolyte solution instead of pure water?
Statistics of coprecipitation. 17In Experiment 1,200.0mL of solution containing 10.0mg of (from ) were treated with excess solution to precipitate containing some coprecipitated . To find out how much coprecipitated was present, the precipitate was dissolved in 35mL of 98wt% and boiled to liberate , which was removed by bubbling gas through the . The HCI/ 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 .
(a) Find the mean, standard deviation, and 95% confidence interval for 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 (FM 233.39) would be expected?
(d) If the coprecipitate is (FM 208.23), what is the average mass of precipitatein Experiment 1. By what percentage is the mass greater than the mass in part (c)?
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