Question #349078
Suppose you have two containers, one containing a dilute acid and the
other a dilute base, but there are no labels on them. Describe how you
could use red cabbage to determine which solution is which.
Expert's answer
Red cabbage contains a water-soluble pigment called anthocyanin that changes color when it is mixed with an acid or a base. The pigment turns red in acidic environments with a pH less than 7 and the pigment turns bluish-green in alkaline (basic), environments with a pH greater than 7.
