Inhibitor

Conc. ppm

Hydrogen evolved ml

θ

%IE

Turmeric extract

1 M HCl

6.20

---

---

50

4.65

0.250

25.0

100

4.03

0.350

35.0

150

3.60

0.419

41.9

200

3.30

0.468

46.8

250

2.90

0.532

53.2

300

2.60

0.581

58.1