SPOT TEST OBSERVATION MATRIX Reagent K.Cro, KSCN NH,OH DMG HCI H,SO, Yellow Clear Clear precipitate No precipitate precipitate No precipitate No reaction precipitate Clear White White Pb(NO,), Orange Dark red Faint orange Clear Clear Clear Fe(NO,), precipitate No precipitate precipitate No reaction No precipitate No precipitate Clear precipitate No precipitate No reaction Yellow no Clear Pink solution Cream White Ni(NO,), solution precipitate No reaction Reddish White Faintly milky white precipitate Clear White No precipitate precipitate precipitate Clear AGNO brownish precipitate precipitate • Clear light yellow No precipitate No precipitate No reaction No precipitate solution Opaque Clear Clear Clear White Ba(NO,), precipitate Undereach reagentindicate whathappened (if anything) when mixed with the metal ion shown on the left. Write balanced reactions to representwhat happenedineach spottest.

SPOT TEST OBSERVATION MATRIX Reagent K.Cro, KSCN NH,OH DMG HCI H,SO, Yellow Clear Clear precipitate No precipitate precipitate No precipitate No reaction precipitate Clear White White Pb(NO,), Orange Dark red Faint orange Clear Clear Clear Fe(NO,), precipitate No precipitate precipitate No reaction No precipitate No precipitate Clear precipitate No precipitate No reaction Yellow no Clear Pink solution Cream White Ni(NO,), solution precipitate No reaction Reddish White Faintly milky white precipitate Clear White No precipitate precipitate precipitate Clear AGNO brownish precipitate precipitate • Clear light yellow No precipitate No precipitate No reaction No precipitate solution Opaque Clear Clear Clear White Ba(NO,), precipitate Undereach reagentindicate whathappened (if anything) when mixed with the metal ion shown on the left. Write balanced reactions to representwhat happenedineach spottest.

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter8: Sampling, Standardization, And Calibration

Section: Chapter Questions

Problem 8.14QAP

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Because of the risk of lead poisoning, the exposure of children to lead-based paint is a significant public health concern. Thefirst step in the quantitative analysis of lead in dried paint chips is to dissolve the sample. Corl evaluated several dissolution techniques.24 In this study, samples of paint were collected and pulverized with a Pyrex mortar and pestle. Replicate portions of the powdered paint were then taken foranalysis. Results for an unknown paint sample and for a standard reference material, in which dissolution wasaccomplished by a 4–6-h digestion with HNO3 on a hot plate, are shown in the following table. (a) Determine the overall variance, the variance due to the method, and the variance due to sampling. (b) What percentage of the overall variance is due to sampling? (c) How might the variance due to sampling be decreased?
A student was tasked to perform gravimetric analysis of a soluble sulfate. His unknown sample weighed 0.7543 g. The sample underwentprecipitation using BaCl2 and was digested for overnight. The precipitate was then filtered off to obtain white crystalline precipitate that was collected inan ash less filter paper. In performing constant weighing, he obtained a crucible mass that is 29.9442 g. After burning his samples inside the crucible,the obtained mass was 30.3375 g. Compute for the theoretical % SO3 obtained by the student and the theoretical mass (g) of SO3 that should be obtained by the student using his weighed sample
A student was tasked to perform gravimetric analysis of a soluble sulfate. His unknown sample weighed 0.7543 g. The sample underwentprecipitation using BaCl2 and was digested for overnight. The precipitate was then filtered off to obtain white crystalline precipitate that was collected inan ash less filter paper. In performing constant weighing, he obtained a crucible mass that is 29.9442 g. After burning his samples inside the crucible,the obtained mass was 30.3375 g.29. Compute for the mass (g) of BaSO4 from the experiment.A) 0.3933B) 0.3393C) 0.3133D) 0.3951E) 0.359130. Compute for the experimental mass (g) of SO3 in grams obtained by the student.A) 0.1439B) 0.1349C) 0.1943D) 0.1394E) 0.359131. Compute for the experimental % SO3 obtained by the student.A) 73.21B) 56.33C) 17.89D) 56.89E) 72.8032. Compute for the theoretical % SO3 obtained by the studentA) 0.3933B) 56.37C) 17.33D) 17.89E) 0.425233. Compute for the theoretical mass (g) of SO3 that should be obtained by the student…
Why is it less desirable to wash AgCl precipitate with aqueous NaNO3 than with HNO3 solution? (Select all that apply.) A) HNO3 evaporates during drying. B)HNO3 is nonvolatile and will lead to a high mass for the precipitate. C )NNO3 is and will lead to a high mass for the precipitate. D)NaNO3 evaporates during drying.
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00 mL of a diprotic acid primary standard solution was accurately prepared to a concentration of 0.1431 M. Three samples of this primary standard solution were used as samples in a titration to standardize an aqueous solution of sodium hydroxide, NaOH, which would be used as a titrant. Using the following table of data for the titration of the primary standard acid with NaOH, calculate the average concentration of NaOH. Trial # Volume of primary standard Initial titrant volume Final titrant volume 1 10.00 mL 8.21 mL 27.22 mL 2 10.00 mL 27.22 mL 46.23 mL 3 10.00 mL 30.28 mL 49.29 mL 0.1506 M 0.0753 M 0.0376 M 0.1431 M 0.0526 M
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