Acidic solutions have pH values less than 7. Stomach acid turns universal indicator paper a strong red colour. This indicates a pH value of 0, the strongest value of acid. Alkaline solutions have ...

Students will be able to explain that if two substances cause turn a pH indicator different colors, they must be different substances. Students will be able to explain that the color that a substance ...

pH is measured using potentiometric methods or pH indicators such as indicator solutions or strips (litmus paper). The pH meter consists of a reference electrode and a pH electrode, and the ...