Design & Technology
Acidity and temperature
Foods can be acidic, alkaline or neutral. The rate a food deteriorates is determined by acidity and temperature. Foods must be reheated properly to prevent food poisoning.
Acidity or alkalinity of food is measured on the pH scale, which runs from 1 to 14. A strong acid will have a pH of 1, and a strong alkali will have a high pH value, like 14.
Some foods, such as citrus fruits, are acidic. Others, like sodium bicarbonate, are alkaline. Foods that are neither acid nor alkaline, like pure water, are called neutral and have a pH value of 7.
Acidity or alkalinity affects:
Acidity or alkalinity can affect food in the following ways: