C is a mixture of two simple inorganic salts, one... | WAEC SSCE - Chemistry - 2024 (Practical)

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C is a mixture of two simple inorganic salts, one of which is a sodium salt.

Perform the following exercises on C. Record your observation and identify any gas(es) evolved. State the conclusions you draw from the results of each test.

(a) Put all of C into a test tube and add about 10 cm\(^3\) of distilled water and shake.

b(i) Put about 2 cm\(^3\) of the filtrate into a boiling tube and heat strongly.

(ii) Put half of the residue into a test tube and add dil. HCl.

(iii) To about 2 cm\(^3\) of the clear solution from b(ii), add aqueous NaOH in drops, then in excess.

(iv) To another 2 cm\(^3\) of the clear solution from b(ii), add aqueous ammonia in drops, then in excess.

Answer

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	Test	Observation	Inference
(a)	C + 10cm\(^3\) of H\(_2\)O	C partially dissolves	C is a mixture of a soluble and insoluble salt.
b(i)	2cm\(^3\) of filtrate + heat	Colourless and odourless gas in form of bubbles	CO\(_3\)\(^{2-}\) suspected
(ii)	residue + t.t + dil. HCl	No visible reaction	NO\(_3\)\(^-\), SO\(_4\)\(^{2-}\) suspected
(iii)	Solution from b(ii) + NaOH in drops and then in excess	White ppt which is dissolves in excess NaOH	Zn\(^{2+}\) , Pb\(^{2+}\) , Al\(^{3+}\) suspected
(iv)	Solution from b(ii) + NH\(_3\) in drops and then in excess	White ppt insoluble in excess NH\(_3\)	Pb\(^{2+}\) confirmed.

	Test	Observation	Inference
(a)	C + 10cm\(^3\) of H\(_2\)O	C partially dissolves	C is a mixture of a soluble and insoluble salt.
b(i)	2cm\(^3\) of filtrate + heat	Colourless and odourless gas in form of bubbles	CO\(_3\)\(^{2-}\) suspected
(ii)	residue + t.t + dil. HCl	No visible reaction	NO\(_3\)\(^-\), SO\(_4\)\(^{2-}\) suspected
(iii)	Solution from b(ii) + NaOH in drops and then in excess	White ppt which is dissolves in excess NaOH	Zn\(^{2+}\) , Pb\(^{2+}\) , Al\(^{3+}\) suspected
(iv)	Solution from b(ii) + NH\(_3\) in drops and then in excess	White ppt insoluble in excess NH\(_3\)	Pb\(^{2+}\) confirmed.

C is a mixture of two simple inorganic salts, one of which is a sodium salt. Perform the following exercises on C. Record your observation and identify any ...

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C is a mixture of two simple inorganic salts, one of which is a sodium salt. Perform the following exercises on C. Record your observation and identify any ...

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