P1 - 4.2 Titration Practical

Question 1

Why do we use titration

Answer 1

To find an unknown concentration of an acid or alkali

Question 2

What 4 pieces of equipment do we need in titration

Answer 2

• pipette
• burette
• conical flask
• white tile

Question 3

What is a pipette used for in titration

Answer 3

To accurately measure a certain volume (25cm^3) of an acid or alkali

Question 4

True or False:
You should add an indicator into the burette

Answer 4

False

Question 5

True or False:
You should not add an indicator into the burette

Answer 5

True

Question 6

What is the burette used for in titration

Answer 6

To add an acid or alkali to the conical flask which can be controlled by the tap

Question 7

What is the purpose of the conical flask in titration

Answer 7

Contains liquid from the pipette - where we will see the chemical reaction happen

Question 8

What is the purpose of the white tile in titration

Answer 8

To place the conical flask on - to make the reaction for clear to us

Question 9

Name the 8 steps in titration

Answer 9

1) using the pipette add 25cm^3 of alkali to a conical flask
2) add a few drops of indicator into the conical flask and put on white tile
3) fill the burette with acid and note the starting volume
4) slowly add acid from the burette into the alkali in the conical flask and swirl the conical flask to mix it
5) stop adding acid when the end point is reached (when the acid has neutralised and the indicator changes colour)
6) note the final volume reading and calculate how much acid you added in total
7) repeat until you get concordant results (volumes of acid that are within 0.10cm^3 of each other)
8) using the concordant results to calculate the mean volume of acid required to neutralise the alkali

Question 10

What are the 3 indicators we can use in titration

Answer 10

Methyl orange
Phenolphthalein
Litmus

Question 11

What colours will the indicator Methyl orange be in an acid and alkali

Answer 11

Yellow in alkali
Red in acid

Question 12

What colours will the indicator phenolphthalein be in an acid and alkali

Answer 12

Pink in alkali
Colourless in acid

Question 13

What colours will the indicator Litmus be in an acid and alkali

Answer 13

Blue in alkali
Red in acid

Question 14

What indicator is yellow in alkali and red in acid

Answer 14

Methyl orange

Question 15

What indicator is pink in alkali and colourless in acid

Answer 15

Phenolphthalein

Question 16

What indicator is blue in alkali and red in acid

Answer 16

Litmus

Question 17

Why do we swirl the conical flask in titration

Answer 17

To make sure the acid and alkali in the conical flask is evenly distributed

Question 18

Why do we use indicators in titration

Answer 18

So we can see the pH change because without it usually acids are clear

Question 19

What is the first step of titration

Answer 19

Using the pipette add 25cm^3 of an alkali to a conical flask

Question 20

After Using the pipette add 25cm^3 of an alkali to a conical flask

What is the second step in titration

Answer 20

Add a few drops of indicator and put the conical flask on a white tile

Question 21

After - Add a few drops of indicator and put the conical flask on a white tile

What is the third step in titration

Answer 21

Fill the burette with acid and take a note of the starting point volume

Question 22

After - Fill the burette with acid and take a note of the starting point volume

What is the fourth step in titration

Answer 22

Slowly add the the acid from the burette to the alkali in the conical flask, swirling it to mix it

Question 23

After - Slowly add the the acid from the burette to the alkali in the conical flask, swirling it to mix it

What is the fifth step in titration

Answer 23

Stop adding the acid when the end point is reached (this is when the acid has neutralised the alkali and the indicator changes colour)

Question 24

After - Stop adding the acid when the end point is reached (this is when the acid has neutralised the alkali and the indicator changes colour)

What is the sixth step

Answer 24

Note the final volume reading and calculate how much acid you added in total

Question 25

After - Note the final volume reading and calculate how much acid you added in total

What is the seventh step in titration

Answer 25

Repeat the titration practical until you get concordant results

Question 26

After - Repeat the titration practical until you get concordant results

What is the final step in titration

Answer 26

Using the concordant results calculate the mean volume of acid required to neutralise the alkali

Question 27

What are concordant results in titration

Answer 27

Results of volumes of acid that are within 0.10cm^3 of each other

Question 28

What is the name given to results of volumes of acid that are within 0.10cm^3 of each other

Answer 28

Concordant results