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REINSCH TEST

Reinsch test revision

By : Hadeer M. Saleh

REINSCH TEST

1

Test:

1. Hydrochloric acid 10% + few bright copper foils. Boil for 5 minutes. If the foils remain bright, it means that the Hcl is free from metals.

2. Then the stomach wash is added (3 volumes to one volume) and boiling is continued for 5 minutes.

3. Remove the copper foils, wash it successively under tap water and dry well.

- Grey deposit ---------- Arsenic.

- Black deposit ---------- Bismuth.

- Violet deposit ---------- Antimony .

- Mirror like ---------- Mercury or silver.

2

To differentiate make sublimation:

a) Place the foils in a small, clean dry sublimation tube.

b) Heat the bottom of the tube while kept inclined 45 till the foils regain its normal bright color.

c) Leave the tube to cool.

d) Examine the ring of the deposit formed on the cooler part of the wall of the tube, under the low power of the microscope.

ARSENIC

Octa and tetrahedral crystals.

Reinsch test

- sensitive qualitative test for detection of soluble inorganic compounds of heavy metals

- sublimation tube containing tetra and octahedral crystals of arsenic

- D.D.

1- mercury ( dark bright globules )

2- antimony ( amorphous deposit .

arsenic

MERCURY

Dark bright globules

Reinsch test

- sensitive qualitative test for detection of soluble inorganic compounds of heavy metals

- sublimation tube containing

dark bright globules of mercury

- D.D.

1- arsenic ( tetra and octahedral crystals )

2- antimony ( amorphous deposit

mercury

Comment :

comment

1- What is the specimen ?

2- What does it show ?

3- D.D.

3

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