Procedure: Step 1: Pipet 25 mL of prepared sample solution, which has been prepared into a 250 mL Erlenmeyer flask. Step 2: Add 3-5 drops of phenolphthalein indicator solution to the sample solution in the 250 mL Erlenmeyer flask. Step 3: Rinse the buret with three 10 mL portions of standardized 0.1 M HC1 acid solution, before fill this acid solution into the buret and record the initial volume of this acid solution in the burette. Step 4: Titrate the sample solution with the standardized 0.1 M HC1 to the endpoint and record the final volume of this acid in the burette. (Note: phenolphthalein endpoint is from pink color. to colorless) Step 5: Repeat the titration for two more times. Step 6: Repeat the same procedure from step 1 to step 5 by using methyl orange as an indicator rather than phenolphathelein. (Note: methyl orange endpoint is from orange to red color). Calculate the alkalinity of the sample for both the indicators and potentiometric method using the following equation: [Alk] = 1/2(mL HCI)(Mc) (100.0 mg / mmol) / L of sample Titration of the polluted stream water sample using 0.1 M HCI with phenolphthalein as indicator 1 0 18.1 18.1 No. of titration Initial volume of 0.1 M HCI (mL) Final volume of 0.1 M HCl (mL) Total volume of 0.1 M HCI used in the titration (mL) Sample alkalinity (mg CaCO3/L) (Round to 0 decimal points) Find sample alkalinity 2 0 18.1 18.1 3 0 18.1 18.1
Procedure: Step 1: Pipet 25 mL of prepared sample solution, which has been prepared into a 250 mL Erlenmeyer flask. Step 2: Add 3-5 drops of phenolphthalein indicator solution to the sample solution in the 250 mL Erlenmeyer flask. Step 3: Rinse the buret with three 10 mL portions of standardized 0.1 M HC1 acid solution, before fill this acid solution into the buret and record the initial volume of this acid solution in the burette. Step 4: Titrate the sample solution with the standardized 0.1 M HC1 to the endpoint and record the final volume of this acid in the burette. (Note: phenolphthalein endpoint is from pink color. to colorless) Step 5: Repeat the titration for two more times. Step 6: Repeat the same procedure from step 1 to step 5 by using methyl orange as an indicator rather than phenolphathelein. (Note: methyl orange endpoint is from orange to red color). Calculate the alkalinity of the sample for both the indicators and potentiometric method using the following equation: [Alk] = 1/2(mL HCI)(Mc) (100.0 mg / mmol) / L of sample Titration of the polluted stream water sample using 0.1 M HCI with phenolphthalein as indicator 1 0 18.1 18.1 No. of titration Initial volume of 0.1 M HCI (mL) Final volume of 0.1 M HCl (mL) Total volume of 0.1 M HCI used in the titration (mL) Sample alkalinity (mg CaCO3/L) (Round to 0 decimal points) Find sample alkalinity 2 0 18.1 18.1 3 0 18.1 18.1
Chapter8: Sampling, Standardization, And Calibration
Section: Chapter Questions
Problem 8.1QAP
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Question
![Procedure:
Step 1: Pipet 25 mL of prepared sample solution, which has been prepared into a 250 mL
Erlenmeyer flask.
Step 2: Add 3-5 drops of phenolphthalein indicator solution to the sample solution in the 250
mL Erlenmeyer flask.
Step 3: Rinse the buret with three 10 mL portions of standardized 0.1 M HC1 acid solution,
before fill this acid solution into the buret and record the initial volume of this acid solution in
the burette.
Step 4: Titrate the sample solution with the standardized 0.1 M HC1 to the endpoint and record
the final volume of this acid in the burette. (Note: phenolphthalein endpoint is from pink color
to colorless)
Step 5: Repeat the titration for two more times.
Step 6: Repeat the same procedure from step 1 to step 5 by using methyl orange as an indicator
rather than phenolphathelein. (Note: methyl orange endpoint is from orange to red color).
Calculate the alkalinity of the sample for both the indicators and potentiometric method using
the following equation:
[Alk] = 1/2(mL HCI)(MHCI) (100.0 mg / mmol) / L of sample
Titration of the polluted stream water sample using 0.1 M HCI with phenolphthalein as indicator
No. of titration
Initial volume of 0.1 M HCI (mL)
Final volume of 0.1 M HCl (mL)
Total volume of 0.1 M HCI used in the titration (mL)
Sample alkalinity (mg CaCO3/L) (Round to 0 decimal
points)
Find sample alkalinity
1
0
18.1
18.1
2
0
18.1
18.1
3
0
18.1
18.1](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2c922b8f-302f-4aea-a8b4-a68e8179362a%2F9183b72e-b65d-4b25-8b8c-a6cb406c6b8b%2F6dxspye_processed.png&w=3840&q=75)
Transcribed Image Text:Procedure:
Step 1: Pipet 25 mL of prepared sample solution, which has been prepared into a 250 mL
Erlenmeyer flask.
Step 2: Add 3-5 drops of phenolphthalein indicator solution to the sample solution in the 250
mL Erlenmeyer flask.
Step 3: Rinse the buret with three 10 mL portions of standardized 0.1 M HC1 acid solution,
before fill this acid solution into the buret and record the initial volume of this acid solution in
the burette.
Step 4: Titrate the sample solution with the standardized 0.1 M HC1 to the endpoint and record
the final volume of this acid in the burette. (Note: phenolphthalein endpoint is from pink color
to colorless)
Step 5: Repeat the titration for two more times.
Step 6: Repeat the same procedure from step 1 to step 5 by using methyl orange as an indicator
rather than phenolphathelein. (Note: methyl orange endpoint is from orange to red color).
Calculate the alkalinity of the sample for both the indicators and potentiometric method using
the following equation:
[Alk] = 1/2(mL HCI)(MHCI) (100.0 mg / mmol) / L of sample
Titration of the polluted stream water sample using 0.1 M HCI with phenolphthalein as indicator
No. of titration
Initial volume of 0.1 M HCI (mL)
Final volume of 0.1 M HCl (mL)
Total volume of 0.1 M HCI used in the titration (mL)
Sample alkalinity (mg CaCO3/L) (Round to 0 decimal
points)
Find sample alkalinity
1
0
18.1
18.1
2
0
18.1
18.1
3
0
18.1
18.1
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