In phosphorus
acid, there is a H on the main carbon. ... While some answers claim that
H3PO4 is stronger than
H3PO3, the claim is falsified by a quick google search: pKa1 of
H3PO3 is 1.2; pKa1 of
H3PO4 is 2.15. Here, '
acidity' may refer to the strength of
acid - the ability to ionise '
more' completely.
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