Paracetamol, also known as acetaminophen, CH_3CONHC_6H_4OH, is a medication used

Question

Paracetamol, also known as acetaminophen, CH_3CONHC_6H_4OH, is a medication used as analgesics and antipyretic drugs and is commercially sold at Tylenol. In a laboratory a tablet of Tylenol contain 325 mg of acetaminophen dissolved in 20 ml mixed ethanol-water(1: 3) solvent. The pH of the sample solution measured to be 5.5 Calculate the hydronium ion concentration, [H_3O^+] in the acetaminophen sample solution. If 5.0 mL of the above sample solution is diluted to 50.0 ml. then what will be the pH of the solution.

Explanation / Answer

From the given data,

(a) pH = -log[H3O+] = 5.5

So, [H3O+] = 3.16 x 10^-6 M

(b) when 5 ml diluted to 50 ml

pH = -log[H3O+] = -log(3.16 x 10^-6 M x 5/50) = 6.50

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