2.1 Preparing primary standard potassium acid phthalate (KHP) solution for standardizing the 0.1 M sodium hydroxide Procedure: Step 1: Using the 4 decimal points analytical balance, weigh about 0.5±0.01g dried KHP in three 250 mL Erlermeyer flasks (Conical flask). Record all the weights. Step 2: Pipet 75 mL distilled water into each of the 250 mL Erlermeyer flasks to dissolve the KHP. Step 3: Add 3 drops of phenolphthalein indicator into each of the 250 mL Erlermeyer flasks. 2.2Standardizing the 0.1 M sodium hydroxide using potassium acid phthalate solution Procedure: Step 1: Rinsed the buret three times with 10 mL of the 0.1 M sodium hydroxide that has been prepared in section 2.1 before pour the 0.1 M sodium hydroxide solution into it. Step 2: Record the initial volume of the 0.1 M NaOH in the burette. Step 3: Titrate the KHP solution in the 250 mL Erlermever flasks, which have been prepared in section 2.1 using 0.1 M NaOH solution in the burette until the faintest pink persists for 30 seconds Step 4: Record final volume of the 0.1 M NaOH in the burette. Step 5: Repeat the titration for the other two KHP solutions in 250 mL Erlermever flask using the same 0.1 M NaOH solution. No. of titration Initial volume of 0.1 M NaOH (mL) Final volume of 0.1 M NaOH (mL) Total volume of 0.1 M NaOH used to react with KHP (mL) KHP mass (gram) Actual NaOH molarity (M) (Round to 3 decimal points) Find actual NaOH molarity 1 0.2 25.5 25.3 0.5 2 25.5 48.2 22.7 0.5 3 19.9 47.7 27.8 0.5
2.1 Preparing primary standard potassium acid phthalate (KHP) solution for standardizing the 0.1 M sodium hydroxide Procedure: Step 1: Using the 4 decimal points analytical balance, weigh about 0.5±0.01g dried KHP in three 250 mL Erlermeyer flasks (Conical flask). Record all the weights. Step 2: Pipet 75 mL distilled water into each of the 250 mL Erlermeyer flasks to dissolve the KHP. Step 3: Add 3 drops of phenolphthalein indicator into each of the 250 mL Erlermeyer flasks. 2.2Standardizing the 0.1 M sodium hydroxide using potassium acid phthalate solution Procedure: Step 1: Rinsed the buret three times with 10 mL of the 0.1 M sodium hydroxide that has been prepared in section 2.1 before pour the 0.1 M sodium hydroxide solution into it. Step 2: Record the initial volume of the 0.1 M NaOH in the burette. Step 3: Titrate the KHP solution in the 250 mL Erlermever flasks, which have been prepared in section 2.1 using 0.1 M NaOH solution in the burette until the faintest pink persists for 30 seconds Step 4: Record final volume of the 0.1 M NaOH in the burette. Step 5: Repeat the titration for the other two KHP solutions in 250 mL Erlermever flask using the same 0.1 M NaOH solution. No. of titration Initial volume of 0.1 M NaOH (mL) Final volume of 0.1 M NaOH (mL) Total volume of 0.1 M NaOH used to react with KHP (mL) KHP mass (gram) Actual NaOH molarity (M) (Round to 3 decimal points) Find actual NaOH molarity 1 0.2 25.5 25.3 0.5 2 25.5 48.2 22.7 0.5 3 19.9 47.7 27.8 0.5
Chapter7: Statistical Data Treatment And Evaluation
Section: Chapter Questions
Problem 7.21QAP
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Transcribed Image Text:2.1 Preparing primary standard potassium acid phthalate (KHP) solution for
standardizing the 0.1 M sodium hydroxide
Procedure:
Step 1: Using the 4 decimal points analytical balance, weigh about 0.5±0.01g dried KHP
in three 250 mL Erlermeyer flasks (Conical flask). Record all the weights.
Step 2: Pipet 75 mL distilled water into each of the 250 mL Erlermeyer flasks to dissolve the
KHP.
Step 3: Add 3 drops of phenolphthalein indicator into each of the 250 mL Erlermeyer flasks.
2.2Standardizing the 0.1 M sodium hydroxide using potassium acid phthalate solution
Procedure:
Step 1: Rinsed the buret three times with 10 mL of the 0.1 M sodium hydroxide that has been
prepared in section 2.1 before pour the 0.1 M sodium hydroxide solution into it.
Step 2: Record the initial volume of the 0.1 M NaOH in the burette.
Step 3: Titrate the KHP solution in the 250 mL Exlermexer flasks, which have been prepared
in section 2.1 using 0.1 M NaOH solution in the burette until the faintest pink persists for 30
seconds
Step 4: Record final volume of the 0.1 M NaOH in the burette.
Step 5: Repeat the titration for the other two KHP solutions in 250 mL Erlermeyer flask using
the same 0.1 M NaOH solution.
No. of titration
Initial volume of 0.1 M NaOH (mL)
Final volume of 0.1 M NaOH (mL)
Total volume of 0.1 M NaOH used to react with KHP (mL)
KHP mass (gram)
Actual NaOH molarity (M) (Round to 3 decimal points)
Find actual NaOH molarity
1
0.2
25.5
25.3
0.5
2
25.5
48.2
22.7
0.5
3
19.9
47.7
27.8
0.5
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