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Chemistry > 4.2 Titration > Flashcards

4.2 Titration Flashcards

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1
Q

Why do we use titration

A

To find an unknown concentration of an acid or alkali

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2
Q

What 4 pieces of equipment do we need in titration

A
  • pipette
  • burette
  • conical flask
  • white tile
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3
Q

What is a pipette used for in titration

A

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

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4
Q

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

A

False

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5
Q

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

A

True

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6
Q

What is the burette used for in titration

A

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

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7
Q

What is the purpose of the conical flask in titration

A

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

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8
Q

What is the purpose of the white tile in titration

A

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

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9
Q

Name the 8 steps in titration

A

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

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10
Q

What are the 3 indicators we can use in titration

A

Methyl orange
Phenolphthalein
Litmus

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11
Q

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

A

Yellow in alkali
Red in acid

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12
Q

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

A

Pink in alkali
Colourless in acid

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13
Q

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

A

Blue in alkali
Red in acid

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14
Q

What indicator is yellow in alkali and red in acid

A

Methyl orange

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15
Q

What indicator is pink in alkali and colourless in acid

A

Phenolphthalein

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16
Q

What indicator is blue in alkali and red in acid

A

Litmus

17
Q

Why do we swirl the conical flask in titration

A

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

18
Q

Why do we use indicators in titration

A

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

19
Q

What is the first step of titration

A

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

20
Q

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

What is the second step in titration

A

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

21
Q

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

What is the third step in titration

A

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

22
Q

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

What is the fourth step in titration

A

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

23
Q

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

A

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

24
Q

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

A

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

25
Q

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

What is the seventh step in titration

A

Repeat the titration practical until you get concordant results

26
Q

After - Repeat the titration practical until you get concordant results

What is the final step in titration

A

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

27
Q

What are concordant results in titration

A

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

28
Q

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

A

Concordant results

Chemistry (6 decks)

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