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3 (a) Dilute hydrochloric acid can be used to make salts - Edexcel - GCSE Chemistry - Question 3 - 2012 - Paper 1
Question 3
3 (a) Dilute hydrochloric acid can be used to make salts. The salts produced are chlorides. Some copper compounds react with dilute hydrochloric acid to produce co... show full transcript
Worked Solution & Example Answer:3 (a) Dilute hydrochloric acid can be used to make salts - Edexcel - GCSE Chemistry - Question 3 - 2012 - Paper 1
Step 1
Which of the following compounds will not neutralise dilute hydrochloric acid to produce copper chloride?
Answer
The compound that will not neutralise dilute hydrochloric acid to produce copper chloride is A copper carbonate. This reaction does not occur as the carbonates typically react with acids to form carbon dioxide and a salt, not producing copper chloride directly.
Step 2
Step 3
Explain which tablet, A or B, is the best value for money.
Answer
To determine the best value for money, we need to calculate the cost per cm³ of hydrochloric acid neutralised by each tablet:
-
For Tablet A:
- Cost: £2.5
- Volume neutralised: 30.6 cm³
- Cost per cm³ = £2.5 / 30.6 cm³ = £0.08151 per cm³
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For Tablet B:
- Cost: £1.2
- Volume neutralised: 10.2 cm³
- Cost per cm³ = £1.2 / 10.2 cm³ = £0.11765 per cm³
Since Tablet A costs £0.08151 per cm³, while Tablet B costs £0.11765 per cm³, Tablet A is the best value for money.
Step 4
Describe a test to show the gas is chlorine.
Answer
To test for chlorine gas, a damp blue or red litmus paper can be used. When exposed to chlorine, the litmus paper will turn white due to bleaching. Therefore, the test can be described as holding damp litmus paper in the vicinity of chlorine gas, which should turn white.
Step 5
Step 6
Explain why it could be dangerous to produce large amounts of chlorine in a factory.
Answer
Producing large amounts of chlorine in a factory can be dangerous because:
- Chlorine can leak out, posing severe health risks as it is toxic and can irritate or damage the respiratory system and skin.
- It is also corrosive and can cause harm to employees if there are unaddressed leaks, which can lead to long-term health effects.