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Author Topic: H3PO2 and H3PO3: How to tell which is which....  (Read 2432 times)

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Giver_Hell

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H3PO2 and H3PO3: How to tell which is which....
« on: June 13, 2004, 02:25:00 AM »
How can one tell the difference between H3PO2 and H3PO3 if both where dilluited with water? Doesn't H3PO2 react with I2 at room temperature?
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WizardX

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Yes
« Reply #1 on: June 13, 2004, 03:46:00 AM »
Yes, but the reaction is not fast due to the I2 solubility in solution. Give it sometime.

H3PO2 is oxidised with hot sulphuric acid forming sulphur.
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