pH
pH is a scale from 0 to 14 that measures how sour or bitter a liquid is.
A row of jars sits on a kitchen counter. On the left is sour lemon juice, in the middle is plain water. On the right is bitter baking-soda water. pH is a number from 0 to 14 that shows a liquid's spot in that row.
Explaining ph by grade level
Some liquids taste sour, like lemon juice. Others taste bitter, like baking soda water. The pH scale tells you which one a liquid is. Rain that is too sour can hurt plants like sunflowers and slow their growth.
Projects that explore ph
The pH scale runs from 0 to 14 and measures how sour or bitter a liquid is. In this experiment, you test the pH of each soda with pH paper. You also soak 40 grams of limestone in each soda for 24 hours and weigh what remains.
Scientists use the pH scale, which runs from 0 to 14, to measure how sour or bitter a liquid is — lower numbers mean a stronger sour taste. In this experiment, each cat food sample soaks in acid solution at pH 2 for 12 hours. That closely simulates a cat's stomach, showing how pH helps re-create real digestive conditions in the lab.
pH is a scale from 0 to 14 that measures how sour or bitter a liquid is. This project tests whether soft drinks can wear away tooth enamel. You place three teeth of equal size and weight into separate bottles of Coca-Cola, Sprite, and root beer, then weigh them each day for five days.
The pH scale measures how sour or bitter a liquid is, with lower numbers meaning more sour. In this experiment, sunflower seeds watered at pH 6 and pH 5 grow normally, but at pH 4 growth slows down sharply. At pH 3 and pH 2, the seeds never sprout at all, showing how even small pH changes can have large effects on living things.