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Acid-Base Titrations - pbt.guc.edu.egpbt.guc.edu.eg/Download.ashx?id=407&file=Acid-Base...

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Acid-Base Titrations Precautions!
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Page 1: Acid-Base Titrations - pbt.guc.edu.egpbt.guc.edu.eg/Download.ashx?id=407&file=Acid-Base Titrations... · Acid-Base Titrations Precautions! 1. Washing Glassware. Washing Glassware

Acid-Base Titrations

Precautions!

Page 2: Acid-Base Titrations - pbt.guc.edu.egpbt.guc.edu.eg/Download.ashx?id=407&file=Acid-Base Titrations... · Acid-Base Titrations Precautions! 1. Washing Glassware. Washing Glassware

1. Washing

Glassware

Page 3: Acid-Base Titrations - pbt.guc.edu.egpbt.guc.edu.eg/Download.ashx?id=407&file=Acid-Base Titrations... · Acid-Base Titrations Precautions! 1. Washing Glassware. Washing Glassware

Washing Glassware

{Washing is a very critical step before titrations}

ALL glassware should be washed with tap water and

distilled water.

• Rinse your pipette with the sample you will titrate.

• Rinse your burette with the titrant.

• NEVER rinse your conical flask with the

sample!

Page 4: Acid-Base Titrations - pbt.guc.edu.egpbt.guc.edu.eg/Download.ashx?id=407&file=Acid-Base Titrations... · Acid-Base Titrations Precautions! 1. Washing Glassware. Washing Glassware

2. Before

Titration

Page 5: Acid-Base Titrations - pbt.guc.edu.egpbt.guc.edu.eg/Download.ashx?id=407&file=Acid-Base Titrations... · Acid-Base Titrations Precautions! 1. Washing Glassware. Washing Glassware

Fill the burette “directly” from the bottle of titrant (Not using a flask)

Use a funnel when filling the burette and make sure no solution is running on the

outside..

Page 6: Acid-Base Titrations - pbt.guc.edu.egpbt.guc.edu.eg/Download.ashx?id=407&file=Acid-Base Titrations... · Acid-Base Titrations Precautions! 1. Washing Glassware. Washing Glassware

Burette

Look for air bubbles!

Remove by opening the tap to a vertical position until a continuous flow of titrant is obtained.

The pipette should also be free of air bubbles

Page 7: Acid-Base Titrations - pbt.guc.edu.egpbt.guc.edu.eg/Download.ashx?id=407&file=Acid-Base Titrations... · Acid-Base Titrations Precautions! 1. Washing Glassware. Washing Glassware

Eye level..

Make sure you take an accurate reading from the burette by lowering (or raising) it to your eye level.

NB: Read the “bottom of the meniscus”

Burette

Page 8: Acid-Base Titrations - pbt.guc.edu.egpbt.guc.edu.eg/Download.ashx?id=407&file=Acid-Base Titrations... · Acid-Base Titrations Precautions! 1. Washing Glassware. Washing Glassware

Remove the funnel before starting your

titration..

Page 9: Acid-Base Titrations - pbt.guc.edu.egpbt.guc.edu.eg/Download.ashx?id=407&file=Acid-Base Titrations... · Acid-Base Titrations Precautions! 1. Washing Glassware. Washing Glassware

Place a piece of white paper under the flask during titration to see the end point clearly..

Page 10: Acid-Base Titrations - pbt.guc.edu.egpbt.guc.edu.eg/Download.ashx?id=407&file=Acid-Base Titrations... · Acid-Base Titrations Precautions! 1. Washing Glassware. Washing Glassware

Don’t forget these!

Page 11: Acid-Base Titrations - pbt.guc.edu.egpbt.guc.edu.eg/Download.ashx?id=407&file=Acid-Base Titrations... · Acid-Base Titrations Precautions! 1. Washing Glassware. Washing Glassware

3. During

Titration

Page 12: Acid-Base Titrations - pbt.guc.edu.egpbt.guc.edu.eg/Download.ashx?id=407&file=Acid-Base Titrations... · Acid-Base Titrations Precautions! 1. Washing Glassware. Washing Glassware

Do not titrate while the burette is hanging far above the flask; every drop of titrant should fall inside the

sample!

Page 13: Acid-Base Titrations - pbt.guc.edu.egpbt.guc.edu.eg/Download.ashx?id=407&file=Acid-Base Titrations... · Acid-Base Titrations Precautions! 1. Washing Glassware. Washing Glassware

Make sure you continuously swirl the flask with dropwise addition of the titrant…

Using both hands will help you avoid missing the exact endpoint..

Page 14: Acid-Base Titrations - pbt.guc.edu.egpbt.guc.edu.eg/Download.ashx?id=407&file=Acid-Base Titrations... · Acid-Base Titrations Precautions! 1. Washing Glassware. Washing Glassware

Titration is done inside the sample NOT on the

walls..

Keep flask in the vertical position.

Page 15: Acid-Base Titrations - pbt.guc.edu.egpbt.guc.edu.eg/Download.ashx?id=407&file=Acid-Base Titrations... · Acid-Base Titrations Precautions! 1. Washing Glassware. Washing Glassware

GOOD LUCK!


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