An acid-base indicator is a substance that changes color as the pH of the solution changes. Indicators work because they are weak acids which when in solution, exist in equilibrium with their ...

When acidic materials are spilled, the clean-up procedure involves adding a base chemical to neutralize the acid. Up to a point, the more base added, the more neutral and less toxic the spill becomes.

USP<301> describes a back-titration to determine the acid-neutralizing capacity (ANC). The method is very fast, easy, and reliable. The Metrohm Application Note AN T-192 includes the effective ...