Table 3 “Values of Ea*, ΔH* and ΔS* for CS in a 1 M HCl solution in presence and absence of CPS extract”.

From: Insight into the anti-corrosion performance of capparis spinoza extract as a green corrosion inhibitor for carbon steel in hydrochloric acid environment

Extract conc. ppm

Ea*kJ mol─1

ΔH*kJ mol─1

ـــΔS*J mol─1K─1

Blank

58.2 ± 0.1609

55.6 ± 0.1622

60.3 ± 0.1452

50

43.8 ± 0.1809

41.2 ± 0.1241

120.3 ± 0.1241

100

42.5 ± 0.2009

39.8 ± 0.1112

125.9 ± 0.2144

150

43.6 ± 0.2117

41.1 ± 0.1012

122.8 ± 0.1104

200

42.1 ± 0.1421

36.1 ± 0.1457

140.6 ± 0.1327

250

33.7 ± 0.1432

30.2 ± 0.1678

162.2 ± 0.1471

300

32.9 ± 0.1247

30.2 ± 0.1754

164.5 ± 0.1120

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