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Assignment #9 :Note: Change any “0” value in your student number to a “7”
Assignment #9 :Note: Change any “0” value in your student number to a “7”.
If b ≥ 7, x = 9 If d ≥ 7, y = 5
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If b ≥ 4, x = 8 If d ≥ 4, y = 4
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If b ≥ 1, x = 7
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x |
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If d ≥ 1, y = 3 |
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y |
Dilutions
- How much of a x.e % (w/v) stock solution is required to create 20.0 mL of a y.i % (w/v)
solution? [3 marks]
- What is the final concentration of a solution if x.e mL solvent is added to y.d mL of a b.c M
solution? [4 marks]
- How much solvent must be added to b.c mL of a 34.6 % (v/v) stock solution to create at c.d %
(v/v) solution? [4 marks]
Serial Dilutions
4. What is the initial concentration of a solution that has a final concentration of 0.dg % (w/v) that has been serially diluted 1/b, then 1/c, then finally 1/d? (3 SD) [5 marks]
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5. |
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You have a |
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n aliq |
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uot |
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of |
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cells |
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with a |
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co |
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ncentrat |
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ion of |
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h |
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x 10 |
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x |
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cells/mL. |
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P |
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pare a serial di |
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lution |
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to create |
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f |
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mL |
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w |
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ith a |
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oncentration of |
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de |
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x |
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10 |
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y |
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cells/mL. |
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Include your plan to accurately create this serial dilution. Include all the volumes of solute,
solvent, and total solution. [10 marks]
Standard Curve
You collect the following data from a Spectrophotometer. [2 marks]
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Concentration (mg/mL) |
% Transmittance |
Absorbance |
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0.0 |
100 |
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0.625 |
93.7 |
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1.25 |
87.6 |
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2.5 |
76.6 |
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5.0 |
57.8 |
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10.0 |
33.7 |
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20.0 |
11.2 |
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Unknown |
cd.e |
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?? = 2 − log (%??)
- Using graph paper, create a handwritten Standard Curve. [10 marks]
Ensure it is properly labeled and professional in appearance.
Using the % Transmittance data for the Unknown to determine the concentration.
- Using Microsoft Excel, create a table of values and a Standard Curve digitally. [10 marks]
Using the equation from the Line of Best Fit, determine the concentration of the Unknown.
Submit a professional looking Table and Standard Curve.
- Calculate the Percent Error for the Unknown, using the digital data as Accepted Value. (2 SD)
[2 marks]
Expert Solution
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