Assertion: hypophosphorous acid's pk | /r/HasProperty | a of −3.6
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Source sentences:
text: The titration of trimethyl phosphate with HCl was also monitored by 31P NMR and the results are consistent with a protonation at the oxygen atom that is doubly bonded to the phosphorus atom leading to a phosphorus centered cation (the protonated trimethyl phosphate was characterized by a pK a of −3.6).