4 (a) Hydrochloric acid reacts with solid B - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2021 - Paper 1
Question 4
4 (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 ar... show full transcript
Worked Solution & Example Answer:4 (a) Hydrochloric acid reacts with solid B - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2021 - Paper 1
Step 1
Give a safety precaution that should be taken during the experiment.
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Answer
Always wear safety goggles and gloves to protect eyes and skin from splashes of hydrochloric acid.
Step 2
Give an improvement to step 4 that would produce more accurate results.
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Answer
Instead of adding half a spatula of solid B, use a mass balance to measure precise amounts of solid B to ensure consistent additions.
Step 3
What is the most likely change in pH during the experiment?
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Answer
C from 7 to 12
Step 4
If some methyl orange indicator is added to the acid in step 2, the mixture changes colour during the experiment. State the colour change.
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colour at start in acid red colour at end yellow
Step 5
Give the name of the piece of apparatus labelled X.
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Answer
Power supply
Step 6
What is the name of this piece of apparatus?
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Answer
A electrode
Step 7
Give one reason why graphite is a suitable material to make Y.
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Graphite is a good conductor of electricity, which is necessary for the electrolysis process.
Step 8
Complete the balanced equation for the reaction that occurs.
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