Test Procedure

You are provided with solution Q. Carry out the tests below and write down your observations and inferences in the spaces provided.

Place 4cm3 of solution Q in a boiling tube and add 10cm3 of distilled water. Divide the resulting solution into 5 portions T1, T2, T3, T4 & T5.

(i)To the 1st portion, add dropwise about 1 cm3 of sodium hydroxide solution
(ii)To the 2nd portion, add 2-3 drops of barium chloride solution
(ii)To the 3rd portion, add dropwise all chlorine water provided
(iii)To the 4th portion add all bromine water provided
(iv)To the 5th portion, add 2 to 3 drops of lead (ii) nitrate solution

Tips: To start, ...click on boiling tube in the display rack to select it before placing the sample.
Follow the procedure sequentially and the sytem monitor instructions.

Tips on the system color code

Colourless Solution

White Precipitate

Brown Solution

Yellow Precipitate

Workbench

VIRTUAL WORKBENCH MONITOR Selected: None

System Initialised. Select boiling tube to start step 1.

Main

T₁

T₂

T₃

T₄

STUDENT LABORATORY WORKBOOK

Procedure	Observations	Inferences
(i)To 1st portion + dropwise about 1 cm3 of NaOH solution
(ii) To 2nd portion + 2 to 3 drops of barium chloride solution
(iii) To 3rd portion + chlorine water provided
(iv) To 4th portion + bromine water provided
(v) To 5th portion + 2 to 3 drops of Pb(NO3)2 solution

OFFICIAL MARKING SCHEME & EXPECTED RESPONSES

Procedure	Observations	Inferences
(i)To 1st portion + dropwise about 1 cm3 of NaOH solution	No white precipitate (1 mark)	Zn2+,Al3+,Pb2+,Mg2+,Ca2+ absent NH4+,Na+,K+ present (1mark)
(ii) To 2nd portion + 2 to 3 drops of barium chloride solution	No white precipitate. (1 Mark)	SO42-,SO32-,CO32- absent (1 mark)
(iii) To 3rd portion + chlorine water provided	Brown solution / Yellow solution (1 mark)	Br-, I- present (1 mark)
(iv) To 4th portion + bromine water provided	Brown solution / Black precipitate (1 mark)	I- present. (1 mark)
(v) To 5th portion + 2 to 3 drops of Pb(NO3)2 solution	Brown yellow precipitate formed (1 mark)	I- confirmed present. (1 mark)
		*Identity of soLUTION Q: Potassium Iodide - KI*

Sample Test 4

Analysis of Solid H