This question is about acids and alkalis - AQA - GCSE Chemistry - Question 2 - 2019 - Paper 1
Question 2
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
All acids produce hydrogen ions (H+) in aqueous solution. Therefore, you should tick the box next to H+.
Step 2
Complete the word equation for the reaction.
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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 should follow these steps:
Measure the volume of each acid sample, P and Q, using a pipette.
Add a few drops of an indicator to the acid.
Fill the burette with the sodium hydroxide solution.
Slowly add sodium hydroxide solution to the acid until the color changes, indicating the endpoint.
Record the volume of sodium hydroxide used for each sample.
Compare the volumes of sodium hydroxide used for samples P and Q. The sample that required more sodium hydroxide to reach the endpoint is the more concentrated sample.
