Virtual lab saltsolutions-rev PDF

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Virtual Lab Salt Solutions, filled out to completion. ...

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MAKING STOCK SOLUTIONS FROM SOLIDS Name:

Date: 10/ 24/ 2017

Last Three Digits of Stony Brook ID #:

Section:

This homework uses the virtual lab. Using a computer that is running Microsoft windows or Macintosh OS 10.1 or higher, go to http://chemcollective.org/activities/vlab/67 to load the lab.

For each of the following problems, calculate the mass of solid needed to make the indicated solution, For the solution assigned to you, use the Virtual Lab to prepare the solution. Use the Solution Viewer to verify that the solution you created has the target concentrations. Explain below all of the steps you took in making the solution and in verifying that it has the correct concentration. Also print the work bench of the problem by using print screen program. For the other three solutions, calculate and report the weight of the substance required to make the indicated solution. Note: The document showing the step by step instructions to prepare the solution is available on Blackboard under Documents. Your assigned solution is determined by the first letter of your last name: A–E F-K L-Q R-Z

Do Problem A in detail – Report only calculated weight for B, C & D Do Problem B in detail – Report only calculated weight for A, C & D Do Problem C in detail – Report only calculated weight for A, B & D Do Problem D in detail – Report only calculated weight for A, B & C

A). 100 mL of solution that is 0.1714 M in sodium cation, using sodium chloride. B). 100.0 mL of a solution that is 0.1714 M in chloride anion, using magnesium chloride. C). 250.0 mL of a solution that is 0.1714 M in sodium cation, using sodium sulfate decahydrate. D). 500.0 mL of a solution that is 0.1714 M in sulfate anion, using sodium sulfate decahydrate.

Which assigned solution did you use? (A) Describe all the steps you took in making your assigned solution. First, the needed supplies from the “Stockroom” tab of the given menu was retrieved. A scale was used to weigh a 250.0 mL beaker and was then set to 0. A sample of NaCl was measured out and placed into a 250.0 mL beaker. The sample was measured to be 1.1040 grams. Distilled water was retrieved from the stock room and 50mL of it was measured out and added to the sample of NaCl. Afterwards, another 25.0 mL of distilled water was measured out and added again. Then, the entire solution of the beaker was transferred into a 100.0 mL volumetric flask. The beaker was rinsed out twice by a 10.0 mL sample of distilled water that was then also placed into the volumetric flask. Then, a 50.0 mL sample of distilled water was used to carefully add more distilled water to the volumetric flask by 0.1 to 1.0 grams until the entire flask contained 100.0 mL of solution. Lastly, calculations were made and the percent deviation turned out to be about 10.21% which is within 10-20% which proves accuracy in this experiment.

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MAKING STOCK SOLUTIONS FROM SOLIDS

Fill in entire column for your assigned solution. Fill in top three lines for other solutions

100 mL of 0.1714 M Na+ Using NaCl

100 mL of 0.1714 M ClUsing MgCl2

250 mL of 0.1714 M Na+ Using Na2SO4 ·10 H2O

500 mL of 0.1714 M SO4 2Using Na2SO4 ·10 H2O

Na+

Cl-

Na+

SO42-

Molarity of ion to be prepared (0.1714 M)

0.1714

0.1714

0.1714

0.1714

Calculated weight of solid (g)

1.0017

0.8159

6.903

27.613

Weight of sold transferred to weighing boat (g)

1.1040

Ion to be prepared

Volume of solution after dilution in Volumetric Flask (mL)

100.0 mL

Molarity of ion as shown in Solution Info panel

0.188905

Percent deviation from targeted Molarity (%)

10.21%...