Equilibrium reaction: HC9H7O4(aq) + H2O(l) ⇌ C9H7O4-(aq) + H3O+(aq)
Step 1: Calculate the concentration of the solution.
molar mass HC9H7O4 = 180.154 g/mol
mass HC9H7O4 = 510 mg x 2 = 1020 mg
moles HC9H7O4 = 5.6618x10–3 mol
[HC9H7O4] = 0.0171 M
Step 2: Construct an ICE chart for the reaction.
Step 3: Write the Ka expression.
Solids and liquids are not included in the expression
Step 4: Calculate the equilibrium concentrations.
The active ingredient in aspirin is acetylsalicylic acid (HC9H7O4), a monoprotic acid with a Ka of 3.3x10-4 at 25°C .
What is the pH of a solution obtained by dissolving two extra-strength aspirin tablets, containing 510 mg of acetylsalicylic acid each, in 330 mL of water?
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