. Explain Law of Reciprocal Proportions


Best Answer

Law of Reciprocal Proportions 

This law which was proposed by Ritcher (1792) states that “when two elements combine separately with fixed mass of third element then the ratio of their masses in which they do so is either the same or some whole number multiple of the ratio in which they combine with each other”.

For example: Carbon, Sulphur and Oxygen form CO2, SO2 and CS2. In CO2 12 parts by mass of carbon combine with 32 parts by mass of oxygen while in SO2 32 parts by mass of Sulphur combine with 32 parts by mass of oxygen. Ratio of masses of carbon and sulphur which combine with fixed mass of oxygen is 12:32 or 3:8.In CS2 12 parts by mass of carbon combines with 64 parts by mass of sulphur therefore the ratio of mass of carbon to sulphur in carbon disulphide is 12:64 i.e. 3:16.

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