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Description
One envelope each of pH 2.0 through 11.0. Each envelope makes 500 mL of solution. Includes one vial of preservative solution. Powders keep 5 years; prepared solutions keep 3 weeks (or 3 months with preservative added). Preservative contains a pH indicator and colors each buffer solution for easy identification.
One envelope each of pH 2.0 through 11.0. Each envelope makes 500 mL of solution. Includes one vial of preservative solution. Powders keep 5 years; prepared solutions keep 3 weeks (or 3 months with preservative added). Preservative contains a pH indicator and colors each buffer solution for easy identification.