Page 44 - E-LKM ACID BASE

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Acid-Base Indicators

Acid-Base indicator is a substance that has a certain color at a
certain pH.

Table 7. pH range

(Martin S. Silberberg, 2000)

1. 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 Figure 22. From left to right are the
anthocyanin pigment. Figure 1.4 color of purple cabbage extract
shows the color of purple solutions of pH 1, 4, 7, 10, and 13

cabbage extract in solutions Sumber: Whitten, Davis and Peck,
within the pH range of 1 to 13. 2008)
nb: silahkan klik gambar untuk
memperbesar gambar

Bahasa Inggris Kimia (PKIM3139) 40