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Absorbance

Concentration of phenolphthalein (µg/mL)

1.

0.0058

12.3

2.

0.0142

30.72

3.

0.0359

61.44

4.

0.0509

92.16

5.

0.0925

153.6

6.

0.179

307.2

Sample problem

(grain)

0.030

51.34