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Following the IUPAC-endorsed procedure, the primary pH standards offered by the equimolal phosphate buffer (Na2HPO4 (0.01 mol⋅kg−1) + KH2PO4 (0.01 mol⋅kg−1)) in the (N-methyl-2-pyrrolidinone + water) solvent mixture of 50 mass percent composition at various temperatures have been determined from potential difference measurements with the reversible Harned cell. Since the essential prerequisite of...
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