Chemistry Notebook
Name:
Date: 2/16/25
Experiment #: 3
Title: Titrations and Titration Curves
Purpose:
The purpose of this lab is to show titrations of different types of acid-base solutions. The types of
titrations performed were standardization and determining the titration curve. The titrations were
conducted to find the unknown concentration of a substance by adding a specific volume of a
solution with a known concentration until the endpoint was reached with proof of a color change
from an indicator.
Procedure:
Experiment #1: Standardization of NaOH
1. Weak acid potassium hydrogen phthalate solution was added into a
beaker with phenolphthalein indicator and water.
2. Strong base NaOH was added into the buret and the beaker was placed under the buret.
3. Small drops of NaOH were titrated into the beaker until the color changed to pink.
4. The volume of NaOH added was recorded.
Experiment #2: Strong acid and strong base titration - Standardization of HCl
1. A few drops of bromothymol blue indicator were added to a flask containing the
strong acid HCl solution.
2. Strong base NaOH was added into the buret and the beaker was placed under the buret.
3. Small drops of NaOH were titrated into the beaker until the color changed from
yellow to blue.
4. The volume of NaOH added was recorded.
Experiment #3: Weak acid and strong base titration - Vinegar
1. Weak acid vinegar (acetic acid) was added into a beaker with phenolphthalein
indicator and water.
, 2. Strong base NaOH was added into the buret and the beaker was placed under the buret.
3. Small drops of NaOH were titrated into the beaker until the color changed to pink.
4. The volume of NaOH added was recorded.
Experiment #4: Strong acid and weak base titration - Household Ammonia
1. An Erleynmeyer flask was placed on a balance scale and tared to be 0 g.
2. Around 2 grams of household ammonia was added to the flask on the balance.
3. Some drops of water were added to the flask and swirled around.
4. A few drops of methyl orange indicator were added to the ammonia and the solution turned
yellow.
5. Strong base HCl was added into the buret for the titration.
6. A few drops of the HCl were titrated in until the color changed from yellow to orange.
7. The volume of the HCl added was recorded.
Experiment #5: Titration of antacid tablets
1. Yellow-colored antacid tablets (base calcium carbonate) were ground up into a powder
using a mortar and pestle.
2. The antacid powder was placed in a weighing bottle and set aside.
3. An Erleynmeyer flask was weighed on a balance scale and tared to be 0 g.
4. About 0.2 grams of the antacid powder was added to the flask.
5. 25 mL of HCl was added to the antacid powder in the flask.
6. The flask was placed in a boiling water bath for a few minutes.
7. 6 drops of bromophenol blue indicator were added to the flask.
8. Strong base NaOH was added into the buret and the beaker was placed under the buret.
9. A few drops of NaOH were added to the beaker until the color changed from yellow to blue.
10. The volume from the NaOH was recorded.
Experiment 6: Titration Curve - Weak acid and strong base
1. A solution of acetic acid was placed in a beaker with a phenolphthalein indicator.
2. The pH of the solution was measured using a pH meter.
3. NaOH was added to the buret and the beaker was placed under the burete.
Name:
Date: 2/16/25
Experiment #: 3
Title: Titrations and Titration Curves
Purpose:
The purpose of this lab is to show titrations of different types of acid-base solutions. The types of
titrations performed were standardization and determining the titration curve. The titrations were
conducted to find the unknown concentration of a substance by adding a specific volume of a
solution with a known concentration until the endpoint was reached with proof of a color change
from an indicator.
Procedure:
Experiment #1: Standardization of NaOH
1. Weak acid potassium hydrogen phthalate solution was added into a
beaker with phenolphthalein indicator and water.
2. Strong base NaOH was added into the buret and the beaker was placed under the buret.
3. Small drops of NaOH were titrated into the beaker until the color changed to pink.
4. The volume of NaOH added was recorded.
Experiment #2: Strong acid and strong base titration - Standardization of HCl
1. A few drops of bromothymol blue indicator were added to a flask containing the
strong acid HCl solution.
2. Strong base NaOH was added into the buret and the beaker was placed under the buret.
3. Small drops of NaOH were titrated into the beaker until the color changed from
yellow to blue.
4. The volume of NaOH added was recorded.
Experiment #3: Weak acid and strong base titration - Vinegar
1. Weak acid vinegar (acetic acid) was added into a beaker with phenolphthalein
indicator and water.
, 2. Strong base NaOH was added into the buret and the beaker was placed under the buret.
3. Small drops of NaOH were titrated into the beaker until the color changed to pink.
4. The volume of NaOH added was recorded.
Experiment #4: Strong acid and weak base titration - Household Ammonia
1. An Erleynmeyer flask was placed on a balance scale and tared to be 0 g.
2. Around 2 grams of household ammonia was added to the flask on the balance.
3. Some drops of water were added to the flask and swirled around.
4. A few drops of methyl orange indicator were added to the ammonia and the solution turned
yellow.
5. Strong base HCl was added into the buret for the titration.
6. A few drops of the HCl were titrated in until the color changed from yellow to orange.
7. The volume of the HCl added was recorded.
Experiment #5: Titration of antacid tablets
1. Yellow-colored antacid tablets (base calcium carbonate) were ground up into a powder
using a mortar and pestle.
2. The antacid powder was placed in a weighing bottle and set aside.
3. An Erleynmeyer flask was weighed on a balance scale and tared to be 0 g.
4. About 0.2 grams of the antacid powder was added to the flask.
5. 25 mL of HCl was added to the antacid powder in the flask.
6. The flask was placed in a boiling water bath for a few minutes.
7. 6 drops of bromophenol blue indicator were added to the flask.
8. Strong base NaOH was added into the buret and the beaker was placed under the buret.
9. A few drops of NaOH were added to the beaker until the color changed from yellow to blue.
10. The volume from the NaOH was recorded.
Experiment 6: Titration Curve - Weak acid and strong base
1. A solution of acetic acid was placed in a beaker with a phenolphthalein indicator.
2. The pH of the solution was measured using a pH meter.
3. NaOH was added to the buret and the beaker was placed under the burete.
