Acids, alkalis and titrations

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Question 45

An experiment is performed to find the volume of nitric acid ( $HNO3\text{HNO}_3$ ) required to neutralise a solution of potassium hydroxide ( $KOH\text{KOH}$ ).

What name is given to this analytical method?

[1]

Which piece of apparatus should be used to measure exactly $cm325.0\text{ cm}^3$ of the potassium hydroxide solution into the reaction flask?

A. beaker
B. measuring cylinder
C. pipette
D. syringe

[1]

State the colours that are seen if methyl orange is used as the indicator in this neutralisation reaction:

Colour before adding the acid:
Colour after the potassium hydroxide is neutralised:

[2]

A student carries out the experiment. Their initial and final burette readings are shown below:

Burette readings

Use the descriptions and diagram to complete the following readings to the nearest $cm30.05\text{ cm}^3$ :

Burette reading after adding the acid ( $cm3\text{cm}^3$ )
Burette reading before adding the acid ( $cm3\text{cm}^3$ )
Volume of acid added ( $cm3\text{cm}^3$ )

[3]

A second student repeated the titration four times, using a different concentration of potassium hydroxide. The table shows their results:

Run	1	2	3	4
Volume of acid added ( $cm3\text{cm}^3$ )	21.85	21.30	21.40	21.35

Concordant results are those within $cm30.20\text{ cm}^3$ of one another. (i) Identify which runs are concordant with one another.

[1]

Use your chosen concordant results to calculate the average (mean) volume of acid added.

[1]

Acids, alkalis and titrations

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54

Question 45

An experiment is performed to find the volume of nitric acid ( $HNO3\text{HNO}_3$ ) required to neutralise a solution of potassium hydroxide ( $KOH\text{KOH}$ ).

What name is given to this analytical method?

[1]

Which piece of apparatus should be used to measure exactly $cm325.0\text{ cm}^3$ of the potassium hydroxide solution into the reaction flask?

A. beaker
B. measuring cylinder
C. pipette
D. syringe

[1]

State the colours that are seen if methyl orange is used as the indicator in this neutralisation reaction:

Colour before adding the acid:
Colour after the potassium hydroxide is neutralised:

[2]

A student carries out the experiment. Their initial and final burette readings are shown below:

Burette readings

Use the descriptions and diagram to complete the following readings to the nearest $cm30.05\text{ cm}^3$ :

Burette reading after adding the acid ( $cm3\text{cm}^3$ )
Burette reading before adding the acid ( $cm3\text{cm}^3$ )
Volume of acid added ( $cm3\text{cm}^3$ )

[3]

A second student repeated the titration four times, using a different concentration of potassium hydroxide. The table shows their results:

Run	1	2	3	4
Volume of acid added ( $cm3\text{cm}^3$ )	21.85	21.30	21.40	21.35

Concordant results are those within $cm30.20\text{ cm}^3$ of one another. (i) Identify which runs are concordant with one another.

[1]

Use your chosen concordant results to calculate the average (mean) volume of acid added.

[1]

Acids, alkalis and titrations

Question 45

Acids, alkalis and titrations Questions

Acids, alkalis and titrations

Question 45

Acids, alkalis and titrations Questions