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Asked Jun 4, 2019
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session.masteringchemistry.com
MasteringChemistry: HW 8
<HW 8
Applications for Dilution Calculations
8 of 8
Small volumes of the stock solution can be measured and delivered using pipettes. Most laboratories that work with solutions are equipped with a series of pipettes that can precisely deliver ranges of volumes (e.g., 1.000
-5.000 mL, 0.100-1.000 mL, 10.0-100.0 , etc.).
CBn
Dliutlon as a procedure In analysis
We sometimes purposely dilute solutions if the analyte concentrations are too high to permit an accurate measurement. For example, a spectrophotometer can measure the amount of light that passes through a sample solution for
wavelengths in the visible (and sometimes ultraviolet) range. Based on the dissolved solute's properties, we can quantify that solute's concentration. If the solute's concentration is too high, a relatively small amount of incident light
having the wavelength that corresponds to the solute's absorption behavior will reach the detector, which results in an inaccurate measurement (consider the result if you blocked the light with an opaque disc). If the solution is diluted,
less light is absorbed, and the detector in the spectrophotometer can generate more reliable data.
When talking about small quantities, it is important to understand the relationship between common prefixes. Here are some relationships that may help when working through Part C.
1 L =
1000 mL
OR
1 mL
OR
0.001 mL
1,000,000 L
1000 L
0.001 L
1 x 10-6 L
1 KL
Part C
The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the instrument returned an error because the absorbance
uL of the sample and injecting it into a cuvette already containing 2.00 mL of water (total volume is 2.00 m + 100.0 L). The absorbance value of the diluted solution corresponded to a concentration of 9.33x10
the concentration of the original solution?
was too high.The sample was then diluted by using a pipette to take 100.0
M.What was
Express the concentration to three significant figures with the appropriate units.
View Available Hint(s)
?
original concentration of Fe2t =19.79r10
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< E session.masteringchemistry.com MasteringChemistry: HW 8 <HW 8 Applications for Dilution Calculations 8 of 8 Small volumes of the stock solution can be measured and delivered using pipettes. Most laboratories that work with solutions are equipped with a series of pipettes that can precisely deliver ranges of volumes (e.g., 1.000 -5.000 mL, 0.100-1.000 mL, 10.0-100.0 , etc.). CBn Dliutlon as a procedure In analysis We sometimes purposely dilute solutions if the analyte concentrations are too high to permit an accurate measurement. For example, a spectrophotometer can measure the amount of light that passes through a sample solution for wavelengths in the visible (and sometimes ultraviolet) range. Based on the dissolved solute's properties, we can quantify that solute's concentration. If the solute's concentration is too high, a relatively small amount of incident light having the wavelength that corresponds to the solute's absorption behavior will reach the detector, which results in an inaccurate measurement (consider the result if you blocked the light with an opaque disc). If the solution is diluted, less light is absorbed, and the detector in the spectrophotometer can generate more reliable data. When talking about small quantities, it is important to understand the relationship between common prefixes. Here are some relationships that may help when working through Part C. 1 L = 1000 mL OR 1 mL OR 0.001 mL 1,000,000 L 1000 L 0.001 L 1 x 10-6 L 1 KL Part C The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the instrument returned an error because the absorbance uL of the sample and injecting it into a cuvette already containing 2.00 mL of water (total volume is 2.00 m + 100.0 L). The absorbance value of the diluted solution corresponded to a concentration of 9.33x10 the concentration of the original solution? was too high.The sample was then diluted by using a pipette to take 100.0 M.What was Express the concentration to three significant figures with the appropriate units. View Available Hint(s) ? original concentration of Fe2t =19.79r10 Previous Answers Request Answer Submit Provide Feedback Refun to Assignment

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Expert Answer

Step 1

From the given data in the question, say

The final concentration of the diluted solution  = c

Volume of sample = V1 

Concentration of original solution  = c1

After diluting with some volume of water new volume = V2 

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Step 2
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