Chm 204 Expt 7 Preparation of a Specific Concentration of Solution
In this experiment, your score for accuracy will determined using the spectrometer in lab. The data submitted here will be checked for (a) calculation errors (Questions 5 and 8), (b) use of correct units (all questions), and (c) proper use of significant figures (all questions).
* Required
Enter your name and your lab partner's name
*
Your answer
Section number
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Section CC (11 AM  2 PM)
Section EE (2 PM  5 PM)
Enter your station (no space between number and letter):
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Use the format 1A, 1B, 2A, 2B, 3A, 3B, etc.
Your answer
Enter your Creighton email address.
Format:
ABC12345@creighton.edu
 Be careful! This is how you will receive the evaluation of your online report.
Your answer
Enter your partner's complete Creighton email address
Your answer
Numbers that are not overly small or large can be entered directly (for example, 0.00448). Numbers larger than 1000 or smaller than 0.001 should be entered in exponential notation. Exponentials must be entered in the ONLY format recognized by Microscoft Excel. If your value has to be reentered for grading, you will receive a 1 pt penalty for each occurrance.
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Example of an acceptable entry: 2.347E6 (Note: No spaces!)
I understand I must use the exponential format as per the example for large and small numbers.
1. (2 pts) What was your assigned concentration? Include units (mol/L OR M).
*
Example: 3.82E4 mol/L
Your answer
2. (2 pts) What is the concentration of your stock solution?
Include units; significant figures matter!
Your answer
3. What volume of the stock solution did you use in your first dilution?
*
Include units and significant figures!
5.00 mL
10.00 mL
4. What final volume did you prepare of your first dilution (using the stock solution)?
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Include units and significant figures!
50.00 mL
100.00 mL
5. (3 pts) What volume of the intermediate solution did you calculate you needed in order to prepare your final solution?
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Include units and significant figures!
Your answer
6. What volume of your final solution did you prepare?
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50.00 mL
100.0 mL
7. (9 pt) What was your concentration according to the spectrometer (enter your best result if you did it more than once)?
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Enter your answer including E06! This is where your accuracy is graded for this experiment.
Your answer
8. (2 pt) What is the percent error between the assigned concentration and your actual concentration?
Units are %. Report your answer to the 0.1 place.
Your answer
Submit
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