GCSE Edexcel Chemistry Acids and alkalis: 6 (a) Hydrochloric acid reacts w

Question

6 (a) Hydrochloric acid reacts with solid B.
Solid B is an alkali.

A student carries out an experiment to see how the pH changes when different masses of solid B are added to dilute hydrochloric acid.

The student uses the following method.

step 1 use a measuring cylinder to measure out 100cm³ of dilute hydrochloric acid
step 2 pour the acid into a beaker
step 3 measure the pH with a pH probe
step 4 add half a spatula of solid B and stir
step 5 repeat steps 3 and 4 until the pH stops changing.

(i) Give a safety precaution that should be taken during the experiment.

(ii) Give an improvement to step 4 that would produce more accurate results.

(iii) What is the most likely change in pH during the experiment?

A from 1 to 7
B from 1 to 12
C from 7 to 12
D from 12 to 1

(iv) If some methyl orange indicator is added to the acid in step 2, the mixture changes colour during the experiment.
State the colour change.

colour at start in acid _________________ colour at end _________________

(b) Concentrated hydrochloric acid can be broken down using electricity.
The apparatus that can be used is shown in Figure 6.

What is the name of the piece of apparatus labelled X?

The rod labelled Y in Figure 6 is made of graphite.
What is the name of this piece of apparatus?

A electrode
B electrolysis
C electrolyte
D electron

(iii) Give one reason why graphite is a suitable material to make Y.

(iv) Complete the balanced equation for the reaction that occurs.

HCl → H₂ + Cl₂

6 (a) Hydrochloric acid reacts with solid B - Edexcel - GCSE Chemistry - Question 6 - 2021 - Paper 1

Worked Solution & Example Answer:6 (a) Hydrochloric acid reacts with solid B - Edexcel - GCSE Chemistry - Question 6 - 2021 - Paper 1

Give a safety precaution that should be taken during the experiment.

Give an improvement to step 4 that would produce more accurate results.

What is the most likely change in pH during the experiment?

State the colour change.

What is the name of the piece of apparatus labelled X?

What is the name of this piece of apparatus?

Give one reason why graphite is a suitable material to make Y.

Complete the balanced equation for the reaction that occurs.

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