C4

Question 1

Which apparatus do you use to measure acid before putting in conical flask?

Answer 1

Pipettes

Question 2

Which one is the red equipment?

Answer 2

Pipette

Question 3

Which apparatus is slowly opened to release alkali?

Answer 3

Burette

Question 4

What do you need to put under the conical flask?

Answer 4

White tile

Question 5

Why do you do titration?

Answer 5

Find an unknown concentration of acid or alkali

Question 6

What does litmus turn with acids?

Answer 6

Red

Question 7

What does litmus paper turn with alkali?

Answer 7

Blue

Question 8

What does phenolphthalein turn with acid?

Answer 8

Colourless

Question 9

What does phenolphthalein turn with alkaline?

Answer 9

Pink

Question 10

What colour does methyl orange turn with acid?

Answer 10

Red

Question 11

What colour does methyl orange turn with alkali?

Answer 11

Yellow

Question 12

Method for titration

Answer 12

1) Use the pipette to add 25 cm 3 of alkali to a clean conical flask
2 Add a few drops of indicator ard put conical flask on white tile.
3 Fill the burette with acid and note the starting volume. f slowly add the acid from the burette to the alkali in the conical flask, swirling to mix.
5 stop adding the acid when the end point is reached (wher the acid has neutralised the alkali and the indicator changes colour).
6 Note final tune reading at eye level and calculate total volume added.
* Repeat until you get concordant results within o: 0.1 cn 3 of eschother 8 calculate mean volume with concordart results