A pH meter measures a pH or the acidity/alkalinity of substances. Most pH meters rely on a glass electrode that measures the number of hydrogen ions in the solution. Usually, pH meters need to be ...

Understanding the nature of pH has bedeviled beginning (and not-so-beginning) chemistry students for nearly as long as chemistry has had students. It all seems so arbitrary, being the base-10 log of ...

When I started gardening, I assumed you could put seeds in dirt, add water and watch them grow into plants. That uneducated approach produced haphazard results and few vegetables. Somehow, I missed ...