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Describe the Laboratory preparation of sulphur (IV) oxide.

Describe the Laboratory preparation of sulphur (IV) oxide.

Answers

Kavungya
(i). Apparatus
fig322942019443.png

(ii). Procedure
- Dilute HCl or H2SO4 is poured into sodium sulphite crystals in the flask.
- The gas produced is passed through conc. Sulphuric acid to dry it.
- If the reaction is slow, the round-bottomed flask is heated (warmed) gently.
- Dry gas is collected by downward delivery as it is denser than air.
fig332942019446.png

Note:
- Nitric (V) acid should not be used.
Reason:
- It is a strong oxidizing agent and cannot therefore reduce the metal sulphites.
- Instead it will oxidize the SO2 produced to sulphuric (VI) acid
Kavungya answered the question on April 29, 2019 at 13:48

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