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This question is about acids and alkalis - AQA - GCSE Chemistry - Question 2 - 2019 - Paper 1

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This question is about acids and alkalis. Which ion do all acids produce in aqueous solution? Tick (✓) one box. H+ H- O2- OH- Calcium hydroxide solution reacts w... show full transcript

Worked Solution & Example Answer:This question is about acids and alkalis - AQA - GCSE Chemistry - Question 2 - 2019 - Paper 1

Step 1

Which ion do all acids produce in aqueous solution?

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Answer

The ion that all acids produce in aqueous solution is the hydrogen ion (H+).

Step 2

Complete the word equation for the reaction.

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Answer

The completed word equation is:

calcium hydroxide + hydrochloric acid → calcium chloride + water.

Step 3

Name apparatus A.

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Answer

Apparatus A is a burette.

Step 4

What is the reading on apparatus A?

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Answer

The reading on apparatus A is 27.6 cm³.

Step 5

Describe how the student could use titrations to find which sample, P or Q, is more concentrated.

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Answer

The student can use the following steps for titration:

  1. Measure the volume of the dilute sulfuric acid sample using a pipette.
  2. Add a few drops of an appropriate indicator to the acid.
  3. Fill the burette with sodium hydroxide solution.
  4. Slowly add the sodium hydroxide solution to the acid while swirling until the endpoint is reached (indicated by a color change).
  5. Record the volume of sodium hydroxide solution used.
  6. Repeat the process for the other acid sample.
  7. Compare the two volumes of sodium hydroxide solution used to determine which sample, P or Q, is more concentrated.

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