potassium oxalate

noun

Chemistry.

a colorless, crystalline, water-soluble, poisonous solid, K 2 C 2 O 4 ⋅H 2 O, used chiefly as a bleaching agent and in medical tests as an anticoagulant.

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On fusion with solid potash at 250� C. it completely decomposes, giving potassium oxalate and hydrogen, C2H6O2 + 2KHO = K2C2O4 + 4H2.

With fused potash it forms potassium oxalate and acetate.

Its principle is that a solution of ferrous oxalate in neutral potassium oxalate is effective as a developer.

Uses.—The part of the plant used in medicine is the leaf which is acid by virtue of the potassium oxalate which it contains.

In fact the salt of sorrel in the leaves contains a large quantity of oxalic acid mixed with potassium oxalate.

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