When I teach canning to others, I like to test the pH of my tomato puree with a litmus paper test. All the canning books tell us that tomatoes can go up to about 4.6 in acidity, right on the edge ...

Equation 1: Formula for the calculation of pH. A pH meter is an electric device used to measure hydrogen ion activity in water-based solutions. 2 The pH meter is used in many applications such as for ...

Scientists at Yale and in Singapore have devised what may be the ultimate acid test — a comprehensive model for estimating the origins of Earth’s habitability, based in part on ocean acidity. The new ...

pH is a measurable parameter between the values of 0 and 14, defining the acidity or alkalinity of a solution. In this article, we will consider how pH can be measured, what it tells us and its role ...