Chemistry /laboratory Assignment

Chemistry /laboratory Assignment

B moodle.oakland.edu

CHM 14? Oakland University

Department of Chemistry
Name Conductivity of Solutions
Partner’s Name Exp mt

I’m-laboratory Assignment
(page 2 ot’4)

Show all calculations for the following solution preparations for full credit. Transfer all

calculated volumes and masses to page 4 of the pre-lab.

1. 100 mL of the 0.0250 M HCl solution by dilution of the 1.00 M HCl solution provided in the
lab.

2. 100 mL of the 0.0125 M HCl solution by dilution of the 0.0250 M HCl solution.

3. 50 ml. oftheo.00(125 M HC I solution by an appropriate dilution ofthe 0.0125 M HCI solution.

4. 100 ml. oft).025 M HNO; prepared from 1.0 M HNO; solution.

5. 100 mL 010.025 M KOH prepared from 1.0 M KOH solutions.

6. For part of the experiment, you will need to prepare 100 mL of 0.025 M C H3Co3H (acetic
acid), starting from commercial “glacial” acetic acid, which has a concentration of 17.4 M.
Devise a method using a two-step serial dilution to make 100 mL of 0.025 M acetic acid
solution. The glassware available is a 100 mL volumetric flask, 50.00 mL volumetric flask,
1.00 mL volumetric pipet, and a 10 mL graduated pipet- For the first step, dilute 1.00 mL of
glacial acetic acid to 50.00 mL to produce “Solution 1″. You will then use Solution 1 to make
the 0.025 M concentration for step 2. Determine the volume of Solution I needed to make 100
mL of 0.025 M acetic acid. (View the serial dilution tutorial.)

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CHM 14? Oakland University
Department of Chemistry
Name, 4 7 A 77 – ‘7 7- Conductiviwot’Solutions
Partner’s Name Fxp “4

Pro-laboratory Assignment
(page 3 of d)

7. Devise a method (two-step serial dilution) similar to that in the prewous question to make
100.00 mL of 0.025 M NH; (ammonia), from concentrated ammonia, which has a
concentration of l5.28 M.

8. Calculate the memes ofthe solids you must measure out to prepare 100 mL each of 0.025 M
KNo3, 0.025 M CuSO4, 0.025 M Cat’NO3j);,0.025 M AltNO3)3, and 0.025 M KC l. (Note that
some of these salts are hurdles; their fomiulas are: C8{No3)3 «ll-110, AltNOm-Slllgo, and
Cu804’5H30). You must include the watcxs of hydration when calculating the formula
weights- Show all vour calculations for full credit.

A. 0.025 M KNO;

B. 0-025 M Cu304

C. 0.025 M (3110103);

D. 0.025 M Al(NOx)z

Ii. 0.025 M KCI.

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CHM 147 Oakland University
Department of Chemistry

Name Conductivity of Solutions

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li. 0.025 M KCl.
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CHM 147 Oakland University
Department of Chemistry
Name Conductivity of Solution
Partner‘s Name l:xp ”4
I’m-laboratory Assignment
(page 4 of 4.)
Record the masses of solids or volumes of more concentrated solutions required to prepare 100 ml
(50 ml of 0.00625 M H( fl) of the following solutions. Bring this sheet to the laboratory the day of
the experiment.
1. 0.0250 M HCl
2. 0.0125 M HCl
3. 0.00625 M HCl
4. 0.025 M HNO;
5. 0.025 M KOH
6. 0.025 M CH3C 031-1
a.
b.
37. 0.025 M NH; (ammonia)
a.
b.
8. 0.025 M KNO;
9. 0.025 M Cu804 – A A A A A A A
10. 0.025 M (Samoa);
ll. 0.025 M Al(NO;)3
12. 0.025 M KC1
Before you prepare solutions, the inslmctor or TA should check your calculated quantities.
l 1
Rev 5-35-15
CHM 147 Oakland University
Department of Chemistry

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