Tests

Observations

Test 1: Appearance of the solutions.

solution K solution L solution M

colourless liquid colourless liquid colourless liquid

Test 2: Universal Indicator paper was used to test the pH of each solution.

solution K solution L solution M

pH 10

pH .....

pH 2

Test 3: Tests on solution K:

  (i) Drops of solution K were added to copper sulfate solution in a test-tube. Excess of solution K was then added to the test-tube.

  (ii) Part (i) was repeated using aqueous aluminium sulfate instead of aqueous copper sulfate.

(iii) A few drops of nitric acid and silver nitrate solution were added to solution K.

pale blue precipitate formed

deep blue solution formed

white precipitate formed

insoluble in excess

no visible reaction

Test 4: Tests on solution L:

Test 3 part (i) was repeated using solution L.

Test 5:

Test 3 part (ii) was repeated using solution L.

Test 6: Test on solution M: Test 3 part (iii) was repeated using solution M.

white precipitate formed