5. Why is it necessary to rinse the precipitate twice with NaNO3 (the rinsings that are discarded)before the final amount of NaNO is added? and Why is it necessary to balance the centrifuge tubes before spinning them?

5. Why is it necessary to rinse the precipitate twice with NaNO3 (the rinsings that are discarded)before the final amount of NaNO is added? and Why is it necessary to balance the centrifuge tubes before spinning them?

Chemistry by OpenStax (2015-05-04)

1st Edition

ISBN:9781938168390

Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Chapter15: Equilibria Of Other Reaction Classes

Section: Chapter Questions

Problem 11E: The Handbook of Chemistry and Physics (http://openstaxcollege.org/l/16Handbook) gives solubilities...

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5. Why is it necessary to rinse the precipitate twice with NaNO3 (the rinsings that are discarded)
before the final amount of NaNO is added? and Why is it necessary to balance the centrifuge tubes before spinning them?

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The Handbook of Chemistry and Physics (http://openstaxcollege.org/l/16Handbook) gives solubilities of the following compounds in grams per 100 mL of water. Because these compounds are only slightly soluble, assume that the volume does not change on dissolution and calculate the solubility product for each. (a) BaSeO4, 0.0118 g/100 mL. (b) Ba(BrO3)2H2O, 0.30 g/100 mL. (c) NH4MgAsO46H2O, 0.033 g/100 mL. (d) La2(MoO4)3, 0.00179 g/100 mL
3. It is used to convert the known weight of the precipitate to the corresponding weight of the analyte. a. Gravimetric factor b. Mole ratio c. Mass ratio d. All of the choices 4. Which of the following is used to express the ppm of the solution? a. Kg analyte/liter solution b. Mg analyte/liter solution x 10^6 G analyte/ g sample x 10^6 d. Kg analyte/kg sample C.
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2. What are the characteristics of an ideal precipitate? Using the Von Weirman ratio, explain the different methods that you can perform to make the precipitate more ideal?
List the steps required in gravimetry to prevent impurities in the final precipitate.Please show COMPLETE solution.
1.In using a burette, why is it important (a) to rinse it with a little of the solution it is going to contain, (b) to clamp it vertically, (c) to have the part below the tap full? 2. The following procedures were carried out during the titration: (a) The sides of the conical flask were washed down with deionized water. (b) The conical flask was frequently swirled or shaken.
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