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 ...

For permission requests, please contact NEJM Reprints at [email protected] There are those, however, who believe that this approach is unsatisfactory because it is difficult to apply and often fails ...

The pH of blood refers to how acidic it is. Changes to blood pH can signal underlying medical issues, including metabolic acidosis, respiratory acidosis, metabolic alkalosis, and respiratory alkalosis ...