Titrations

Question 1

Step by step of Titration method

Answer 1

1. pipette alkali solution into conical flask
2. add few drops of phenophthalein indicator
3. put acid into the burette - BELOE EYE LEVEL
4. acid is added to the alkali with swirling until the indicator changes colour (end point) - pink to colourless
5. record volume of acid used to neutralise the alkali
6. REPEAT unti concordent results

Question 2

How would you make pure salt crystals from a titration

Answer 2

• find mean of the concordent results
• repeat titration without indicator
• heat solution to crystallisation point
• allow to cool and fully crystallise
• filter and rinse crystals with distilled water
• leave to dry

Question 3

What must burette volumes be written in

Answer 3

• 2d.p.
• ending in 0 or 5

Question 4

Concordance results must differ by …….. or……

Answer 4

0.10 cm^3 or less.