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Physical & Chemical properties

Dissociation constant

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SMBT is an organic salt of strong base NaOH and weak acid of MBT; and hence its aqueous solution has a basic character. The marketed aqueous solutions of SMBT have normally a w/w concentration of 30% to 50% with a pH of ca. 10. The ionisation state depends upon pH and the pKa of the weak acid MBT, which has been experimentally determined to be 7.03 at 20 +/-1°C (CMA, 1989). Under environmentally relevant pHs (4 -9), the higher is the pH and the higher is the percentage of undissociated MBT.

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