Purification of the surfactant has been described.9 Sodium salts were used for the buffers.Kinetics. The formation of o-nitrophenoxide ion at 25.0 °C was followed at 405 nm, using a Gilford spectrometer for the slower reactions and a Durrum stopped flow spectrometer for the faster reactions. The pH of the buffered solutions was measured in the absence of surfactant. The first-order rate constants, are in reciprocal seconds.
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