Halide Ions Testing

Question 1

How do you test for halide ions?

Answer 1

A. Fill test tube to depth of about 2cm with one of solutions containing halide ions (CI, Br or I ions)
B. Add few drops of dilute nitric acid the shake test tube to mix contents
C. Add few drops of silver nitrate solution. Record colour of precipitate produced.
D. Repeat steps A-C with other known solutions that contain halide ions.

Precipitate = solid formed from two solutions

Question 2

How do you test for sulfate ions?

Answer 2

E. Fill test tube to depth around 2cm with solution containing sulfate ions, SO4(subscript) 2-(superscript)
F. Add few drops of dilute hydrochloric acid then shake test tube to mix contents
G. Add few drops of barium chloride solution. Record colour of precipitate produced.

Question 3

How do you test for carbonate ions?

Answer 3

H. Fill test tube to depth of about 2cm with solution containing carbonate ions, CO3(subscript)2-(superscript)
I. Add few drops of dilute nitric acid or dilute hydrochloric acid. Record whether bubbling occurs (carbon dioxide produced)

Question 4

What colour appears when testing for halide - chloride CI

Answer 4

White

Question 5

What colour appears when testing for halide - Bromide Br

Answer 5

Cream

Question 6

What colour appears when testing for halide - iodide I

Answer 6

Yellow

Question 7

What result happens when testing for carbonate ions (CO3(subscript)2-(superscript)

Answer 7

Result when dilute acid is added = bubbles

Question 8

What happens with confirmatory test when testing for carbonate ions (CO3(subscript) 2-(superscript))

Answer 8

Cloudy lime water

Question 9

What happens when testing for sulfate ions (SO4(subscript) 2-(superscript))

Answer 9

Result when barium nitrate is added = white