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Describe the laboratory preparation of hydrogen sulphide gas.

Describe the laboratory preparation of hydrogen sulphide gas.

Answers

Kavungya
fig112942019308.png

(ii). Procedure:
- Dilute hydrochloric acid is poured into Iron (II) sulphide in a round-bottomed flask.
- Resultant gas is passed through U-tube with anhydrous calcium chloride to dry the gas.
- This can also be done with phosphorous (V) oxide.

fig122942019310.png

(iii). Collection of gas
- When dry, the gas is collected by downward delivery because it is denser than air.
- When wet is collected over warm water because it is more soluble in cold water.
* Hydrogen sulphide test.
- When a strip of filter paper soaked in aqueous lead (II) ethanoate is put in hydrogen sulphide, the paper turns black or dark brown.
Reason:
- Due to the formation of lead (II) sulphide which is black.
fig132942019312.png
Kavungya answered the question on April 29, 2019 at 12:13

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