miscellaneous test form 4 periodic table

Question 1

Test for chlorine gas

Answer 1

test: Damp blue litmus paper
result: litmus paper will turn from blue to white(it has been bleached)

Question 1

Test for halide ions

Answer 1

first if working with unknown solid dissolve in water

then dilute sample about to be tested with nitric acid to remove impurities

Then add silver nitrate(AgNO3)

A precipitate will be formed and its color depends on the ion in the substance

white for chloride Cl-1
cream for Bromide BR-1
yellow for iodide

then you can add conc ammonia (NHg)

chlorides’ and bromide’s precipitate will dissolve
While iodides won’t

Question 2

test for water

Answer 2

1)add water to ANHYDROUS Copper(III) sulfate

It will change color from White to blue

2)Add ANHYDROUS Cobalt(II) chloride paper

The colour will change from Blue to pink

Question 3

test for hydrogen

Answer 3

A lit splint will produce a squeaky pop when close enough to hydrogen

Question 4

Test for oxygen

Answer 4

A glowing splint will be reignited in the presence of oxygen

Question 5

test for alkaine nature of a substance

Answer 5

1. red litmus will turn blu and blue litmas will stay blue
2. methyl orange will turn orange
3. phenolphalien will turn purple