Neco 2022 Chemistry Question 3

Practice practical question 3 from the 2022 Neco Chemistry examination. This question covers Chemical Bonding .

Neco 2022 Chemistry Practical

Topic: Chemical Bonding

Question 3 NECO • 2022 • CHEMISTRY • practical

A student is given an unknown white crystalline solid that is suspected to be either sodium chloride (NaCl) or potassium chloride (KCl). Using the following experimental procedures, the student must identify the compound and comment on the nature of the bonding present. Procedures 1. Perform a flame test on a small amount of the solid. 2. Dissolve a separate portion of the solid in 20 mL of distilled water. 3. Add a few drops of silver nitrate solution (0.1 M AgNO₃) to the aqueous solution and observe any precipitate. 4. Test the conductivity of the aqueous solution with a simple conductivity tester. Observations recorded by the student - Flame colour: violet - Solution is clear and colourless. - Immediate formation of a white precipitate on addition of AgNO₃. - The solution conducts electricity strongly.

( a )

Write the balanced chemical equation for the reaction of each possible salt (NaCl and KCl) with silver nitrate.

( b )

Based on the flame‑test observation, state which cation is present in the unknown solid.

( c )

Identify the unknown compound and indicate the type of chemical bond that predominates in it.

( d )

Suggest two possible sources of error in the experiment and explain how each could affect the identification of the salt.

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This is Neco 2022 Chemistry Question 3. It is one of the practical questions from the 2022 Neco Chemistry examination.

The question covers Chemical Bonding .

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