1. Tests can be carried out on salts to identify the ions present in the salts - Edexcel - GCSE Chemistry - Question 1 - 2015 - Paper 1
Question 1
1. Tests can be carried out on salts to identify the ions present in the salts.
(a) (i) A flame test on a salt produces an orange-red colour.
Which ion is resp... show full transcript
Worked Solution & Example Answer:1. Tests can be carried out on salts to identify the ions present in the salts - Edexcel - GCSE Chemistry - Question 1 - 2015 - Paper 1
Step 1
Which ion is responsible for the orange-red colour?
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Answer
The ion responsible for the orange-red colour in a flame test is the calcium ion, Ca²⁺. Therefore, I would put a cross (X) in box A.
Step 2
Describe what is seen when the silver nitrate solution is added to the mixture.
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Answer
When silver nitrate solution is added to the acidified chloride solution, a white precipitate forms. This is due to the reaction between silver ions and chloride ions to form silver chloride (AgCl), which is insoluble in water. The observation is a cloudy white suspension indicating a positive test for chloride ions.
Step 3
Which of these salts is insoluble in water?
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Answer
The salt that is insoluble in water from the given options is lead chloride (B). Therefore, I would put a cross (X) in box B.
