6 (a) Hydrochloric acid reacts with solid B - Edexcel - GCSE Chemistry - Question 6 - 2021 - Paper 1
Question 6
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 a... show full transcript
Worked Solution & Example Answer:6 (a) Hydrochloric acid reacts with solid B - Edexcel - GCSE Chemistry - Question 6 - 2021 - Paper 1
Step 1
(i) Give a safety precaution that should be taken during the experiment.
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Answer
Wear safety goggles to protect eyes from splashes of hydrochloric acid.
Step 2
(ii) Give an improvement to step 4 that would produce more accurate results.
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Answer
Use a digital balance to measure solid B more precisely instead of a spatula.
Step 3
(iii) What is the most likely change in pH during the experiment?
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Answer
The most likely change in pH during the experiment is from 1 to 12, as an alkali (solid B) is added to an acid (hydrochloric acid).
Step 4
(iv) State the colour change.
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Answer
colour at start in acid: red / orange; colour at end: yellow / green.
Step 5
(i) Give the name of the piece of apparatus labelled X.
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Answer
Electrolytic cell.
Step 6
(ii) What is the name of this piece of apparatus?
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Answer
A electrode.
Step 7
(iii) Give one reason why graphite is a suitable material to make Y.
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Graphite is a good conductor of electricity.
Step 8
(iv) Complete the balanced equation for the reaction that occurs.
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