Abstract
The protonation constants, K r , for the ligands succinic acid (SA), mono-methyl succinate (MS) and propionate (PA) have been determined, at 25°C, by glass electrode potentiometry in 3 mol/dm 3 ( M) NaNO 3, KNO 3, NH 4NO 3, Ca(NO 3) 2 and Et 4NBr aqueous media. Results are compared with literature constants determined in 3 M NaClO 4. The order of stability was found to be K 1(SA) > K 1(PA) > K 1(MS) > K 2(SA) and for the ligands in the different media K r followed the general trend with respect to the background electrolyte Et 4NBr > NaClO 4 > KNO 3 > NaNO 3 > NH 4NO 3 > Ca(NO 3) 2.
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