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All the following except one is needed for a Lassaigne test in the laboratoryA. a mortar and a pestleB. a water bathC. a funnelD. round-bottomed flask

Question

All the following except one is needed for a Lassaigne test in the laboratoryA. a mortar and a pestleB. a water bathC. a funnelD. round-bottomed flask

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Solution

The Lassaigne's test is a test for the detection of nitrogen, sulphur, halogens and phosphorus in an organic compound. The apparatus and materials needed for this test include a fusion tube, a Bunsen burner, a test tube, a dropper, distilled water, and a solution of ferrous sulphate and ferric chloride.

A. A mortar and a pestle - This is not typically needed for a Lassaigne's test. These tools are used for grinding and crushing substances, but in this test, the organic compound is usually directly heated in the fusion tube.

B. A water bath - This could be used in the test, particularly in the cooling process after the fusion of the organic compound.

C. A funnel - This could be used in the test, particularly in the filtration process after the fusion and cooling of the organic compound.

D. A round-bottomed flask - This could be used in the test, particularly in the heating process.

So, the answer is A. A mortar and a pestle.

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