Experiment 4: Standardization of an Aqueous NaOH Solution

Question 1

Purpose of Experiment 4

Answer 1

Determine the concentration of a solution

Question 2

Standardization

Answer 2

Determine the exact concentration of a solution by titration

Question 3

Safety Precautions

Answer 3

Using concentrated NaOH, if came in contact wash with a lot of water

Question 4

Procedure: Making base

Answer 4

1. Weigh out ~2.5 g of KHP and dissolve it in a 250 mL volumetric flask filled halfway with DI water (125 mL)
   then add the rest
   2 . Shake flask to make sure solution is uniform
2. Calculate molarity (mol/L)

Question 5

Procedure: Making acid

Answer 5

1. Add 400 mL of water to 1 L bottle
2. Add 6 mL of the 10M NaOH
3. Add 200 mL more of water to the bottle (600 mL)

Question 6

Procedure: Standardization

Answer 6

1. Clean and rinse pipet and
2. Transfer a small amount into a beaker and transfer that into a Erlenmeyer flask
3. Add 3 drops of the indicator into the flask
4. Record the initial volume and titrate until it is a light pink
5. Record the final volume
6. Calculate molarity