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Exact ph and percent ionization of the solution

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Reference no: EM132418317

Acetylsalicylic acid, also known as Aspirin, has a formula of C9H8O4 and is a weak acid with a Ka of 3.0 x 10-4. It has been suggested that a regular low-dose regimen of "baby aspirin", approximately 81 mg, may help reduce the risk of a heart attack.

a. Determine the molarity of acetylsalicylic acid in a solution of "baby aspirin" if a tablet containing 81.0 mg of acetylsalicylic acid is dissolved in a cup of water (8.0 fluid ounces). Note: 1 fl oz = 29.5735 mL.

n Acid = 81 mg * (1 g / 1000 mg) * (1 mol / 180.16 g) = 4.5x10-4 mol

V = 8 oz * (29.5735 mL / 1 oz) * (1 L / 1000 mL) = 0.237 L

M = n / V = ??4.5x10-4 mol / 0.237 L = 0.0019 M

c. Calculate the exact pH and percent ionization of the solution made in part a.

d. Calculate the equivalence point if the solution made in part a is titrated with 0.10 M NaOH. 

The base volume is calculated at the equivalence point:

Reference no: EM132418317

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