Standardization of HCl with NaOH 1. Clean and dry a plastic bottle. Weight out a

ID: 894915 • Letter: S

Question

Standardization of HCl with NaOH

1. Clean and dry a plastic bottle. Weight out about 4 grams of NaOH dry pellets and add to the bottle. Weigh and record mass.

2. Add 1 liter of distilled water to the bottle and mix till pellets dissolve.

3. Clean and dry a plastic bottle and add 500mL distilled water

4. In fume hood measure about 4.14 mL of 37% (w/w) HCl. Then transfer to plastic bottle and mix to completely dissolve.

5. Transfer 10 mL of HCL solution to three-250 Erlenmeyer flasks.

6. Add 3 drops of bromocresol green to each flask. Titrate till reaches a blue/green

7. Record initial and final volume.

8. Repeat for the next 2 flask.

Data:

4.05 grams of NaOH pellets dissolved into 1 Liter of distilled water

Titration 1: 10.7 mL of NaOH added

Titration 2: 10.1 mL of NaOH added

Titration 3: 10.1 mL of NaOH added

Whats the molarity for all trials?

NaOH molarity = ( 4.05 / 40 ) x 1/1 = 0.10 M

HCl volume (V1) = 10 ml

HCl molarity (M1) = ? M

NaOH molartiy (M2) = 0.1 M

NaOH volume for trail 1 = 10.7 ml

M1 V1 = M2 V2

M1 x 10 = 0.1 x 10.7

M1 = 0.107 M

for trail 2 and 3

M1 x10 = 10.1 x 0.1

M1 = 0.101 M

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