Cabbage Juice Lab Purpose:To test the pH of different solutions using cabbage juice.
Why use cabbage juice?• By boiling the red cabbage leaves, we extracted a class of pigment molecules called anthocyanins into solution. Anthocyanin molecules will change their color depending upon the pH of their environment and can indicate the pH of a solution.
What is pH?• The pH scale measures how acidic or basic a substance is.• It ranges from 0 to 14.• A pH of 7 is neutral.• A pH less than 7 is acidic, and a pH greater than 7 is basic.
What should SOIL pH be to help plant growth?Most soils for plant If the pH of the soil is too growth should be acidic, this may slow around 6 to 7 (slightly down the acidic to neutral) for decomposition process optimal growth. If it is of bacteria. too acidic, lime can be added to raise the pH level.
Investigation• Identify each solution as either an acid, base, or neutral.