Abstract
In this study paracetamol drug is used to reduce the conductivity of 0.5M hydrochloric acid at different concentrations for each one of them at different temperatures ranged (30-60)°C. Generally , increasing of the concentration of  the inhibitor leads to reducing in conductivity of the acid at constant temperature. On the other hand, at constant concentration of inhibitor, the conductivity is reduced as temperature increased i.e., paracetamol can adsorbed chemically on the metal or alloy. Furthermore the kinetic study of the molar conductance process reveal that in presence of paracetamol the activation energy and enthalpy of activation are negative compared with their values in absence of paracetamol where they are negative because the reducing the conductivity in presence of paracetamol where the non spontaneous property for the conductance of acid is increased as the paracetamol concentration increased in addition to increasing the negative value of entropy in presence of paracetamol that indicate to restrict for the mobility of hydrogen and chloride ions which correspond to 90.47% as efficiency of reducing the conductance of acid by paracetamol. On the other hand thermodynamic study is achieved which explained the adsorption of paracetamol obey to Freundlisch model.Â
Highlights
Acid pickling baths are employed to remove undesirable scale from the surface of the metals
There are several conclusions can be summarized as below: 1. Paracetamol acts as a good retarder for the molar conductance of 0.50M HCl at different concentration i.e., (1050) ppm at constant temperature where as the concentration of paracetamol increased, the molar conductance of acid increased at all temperatures tin this study
The molar conductance of acid is reduced as temperature increased in range (30-60) °C reducing the molar conductance is 90.47% which encourage us to use the paracetamol as corrosion inhibitor for the metals or alloys in acidic media
Summary
Acid pickling baths are employed to remove undesirable scale from the surface of the metals. Paracetamol (acetaminophen) is commonly used as an analgesic and antipyretic drug in pharmaceutical formulations solely or in the mixtures with a few contaminants, typically caffeine, acetylsalicylic acid and some others It is extensively used in the treatment of mild to moderate pain and fever and available without a prescription. The effect of temperature on the inhibition effect of paracetamol against the conductivity of the 0.50M HCl at constant concentration was studied at range (30-60) oC in order to evaluate the paracetamol as a corrosion inhibitor for steel or other alloy or metals depending on the reducing of the conductivity of the corrosive environment like acid i.e.,0.50M HCl. the molar conductivity is used in this study because the concentration of electrolyte (corrosive environment) is taken into account
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