Titrations

Question 1

What three things can titrations be used for?

Answer 1

• Finding the concentration of a solution
• Identification of unknown chemicals
• Finding the purity of a substance

Question 2

Name the apparatus use to hold the acid or alkali in a titration?

Answer 2

Burette

Question 3

Name the apparatus used to measure the liquid that goes in the conical flask during a titration?

Answer 3

Pipette

Question 4

What is the method for a titration

Answer 4

1. Weigh the solid sample in a boat and transfer to a beaker.
2. Re-weigh the empty boat.
3. Dissolve the solid in distilled water and transfer the resulting solution to a volumetric flask via
   a funnel.
4. Wash the beaker with distilled water and add the washings to the volumetric flask.
5. Fill the volumetric flask to the mark, adding the last few cm3 of water with a dropping pipette
   so that the meniscus sits on top of the line.
6. Mix thoroughly by inverting the flask several times.

Question 5

What is the outline of the method to calculate titrations?

Answer 5

• Measure known volume of solution into conical flask using a pipette
• Add other solution to burette and measure volume to nearest 0.05cm3
• Add indicator to conical flask
• Do a rough titration and subtract initial titre from final titre
• Do an accurate titrations
• Repeat until you have two concordant results - within 0.10cm3