GCSE Edexcel Chemistry Ionic Compounds: The table shows some information

Question

The table shows some information about the atoms and the ions of chlorine and sodium.

Complete the table.

|                | symbol  | number of electrons in |
|----------------|---------|------------------------|
| chlorine       | Cl      | 17                     |
| sodium         | Na      | 10                     |

When silver nitrate solution, AgNO₃, is added to sodium chloride solution a white precipitate is formed.

(i) Write the balanced equation for this reaction.

(ii) Silver nitrate solution can be added to a solution to test for the presence of chloride ions.
In this test, dilute nitric acid is added to the solution, followed by the silver nitrate solution.
A white precipitate shows the presence of chloride ions.

Why must the dilute nitric acid be added to make this a reliable test?
Put a cross (X) in the box next to your answer.

A  to dilute the solution of chloride ions

B  because the precipitate only forms if dilute nitric acid is added

C  to remove other ions that would also form a white precipitate

D  to stop the white precipitate changing colour

The table shows some information about the atoms and the ions of chlorine and sodium - Edexcel - GCSE Chemistry - Question 6 - 2012 - Paper 1

Worked Solution & Example Answer:The table shows some information about the atoms and the ions of chlorine and sodium - Edexcel - GCSE Chemistry - Question 6 - 2012 - Paper 1

Complete the table.

Write the balanced equation for this reaction.

Why must the dilute nitric acid be added to make this a reliable test?

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