Question

a. Distinguish between the following pairs of compounds using the reagent given in the bracket: [E
i. Ferrous sulphate solution and Ferric sulphate solution (using sodium hydroxide solution)
Ammonium hydroxide and Sodium hydroxide (using copper sulphate solution)
​

Answer 1

FeSO

4

+2NaOH→

dirty green

Fe(OH)

2

↓

+Na

2

SO

4

Fe

2

(SO

4

)

3

+6NaOH→

reddish brown

2Fe(OH)

3

+3Na

2

SO

4