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Acid-Base Indicators
Acid-Base indicator is a substance that has a certain color at a
certain pH.
(Martin S. Silberberg, 2000)
Natural indicators
Many naturan dyes found in
fruits, vegetables, and flowers
act as naturally occuring
indicators by changing color
with changes in then pH of
solutions. One of them is extract
of purple cabbage. The extract
of purple cabbage contains
anthocyanin pigment. Figure 1.4
shows the color of purple Figure 13. From left to right are
the color of purple cabbage
cabbage extract in solutions extract solutions of pH 1, 4, 7, 10,
within the pH range of 1 to 13. and 13
Sumber: Whitten, Davis and Peck,
1996)
25
