F is an inorganic salt. Carry out the following exercises on F. Record your observations and identify any gas(es) evolved. State the conclusions you draw fr...

Assessment: WAEC SSCE - Chemistry - 2024 (Practical) Subject: Chemistry

Question 1 Report

F is an inorganic salt. Carry out the following exercises on F. Record your observations and identify any gas(es) evolved. State the conclusions you draw from the results of each test.

(a) Transfer F into a test tube and add dil. HCl to it until a clear solution is obtained.

(b) Divide the clear solution obtained from (a) into two portions

(i) To the first portion add NaOH\(_{(aq)}\) in drops and then in excess.

(ii) To the second portion, add few drops of potassium hexacyanoferrate (II) solution.

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	TEST	OBSERVATION	INFERENCE
(a)	F + t.t + dil. HCl	Effervescence of colourless, odourless gas. Evolved gas turned lime water milky	CO\(_2\) from CO\(_3\)\(^{2-}\) or HCO\(_3\) confirmed.
b(i)	1st portion + t.t + NaOH in drops and then in excess + heat to warm	No visible reaction, No ppt was also formed Effervescence of a colourless gas with an irritating smell. Gas turned red litmus to blue,also produced white fumes with conc. HCl	NH\(_3\) from NH\(_4\)\(^+\) confirmed.
(ii)	2nd portion + t.t + few drops of potassium hexacyano ferrate(II) solution	No ppt formed and no visible reaction was observed	Fe\(^{2+}\)/ Fe\(^{3+}\) absent

	TEST	OBSERVATION	INFERENCE
(a)	F + t.t + dil. HCl	Effervescence of colourless, odourless gas. Evolved gas turned lime water milky	CO\(_2\) from CO\(_3\)\(^{2-}\) or HCO\(_3\) confirmed.
b(i)	1st portion + t.t + NaOH in drops and then in excess + heat to warm	No visible reaction, No ppt was also formed Effervescence of a colourless gas with an irritating smell. Gas turned red litmus to blue,also produced white fumes with conc. HCl	NH\(_3\) from NH\(_4\)\(^+\) confirmed.
(ii)	2nd portion + t.t + few drops of potassium hexacyano ferrate(II) solution	No ppt formed and no visible reaction was observed	Fe\(^{2+}\)/ Fe\(^{3+}\) absent

F is an inorganic salt. Carry out the following exercises on F. Record your observations and identify any gas(es) evolved. State the conclusions you draw fr...

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