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Chapter 27: Q3P (page 767)
Why is high relative supersaturation undesirable in a gravimetric precipitation?
The high relative supersaturation undesirable in a gravimetric precipitation due to the fast nucleation- suspension of colloids would be higher would isn’t desirable.
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Determination of sulfur by combustion analysis produces a mixture of and that can be passed through to convert both into , which is titrated with standard base. When 6.123m g of a substance were burned, the required 3.01mL of0.010576MNaOHfor titration. Find wt% sulfur in the sample.
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?
A 50.00-mL solution containingwas treated with excess AgNo3 to precipitate 0.2146 g of AgBr (FM 187.772). What was the molarity of NaBr in the solution?
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)?
A mixture weighing 7.290mgcontained only cyclohexane, (FM 84.159), and oxirane, (FM 44.052). When the mixture was analyzed by combustion analysis, 21.999mg of(FM 44.009) were produced. Find the weight percent of oxirane in mixture.
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