We are being asked to calculate the pH of a 0.0335 hypochlorous acid solution.
Hypochlorous acid (HClO) has a low Ka, therefore we know that it is a weak acid.
Since we’re dealing with a weak acid and Ka is an equilibrium expression, we will have to create an ICE chart to determine the equilibrium concentration of each species:
• HClO → weak acid → proton donor
• H2O → will act as the weak base → proton acceptor
Equilibrium reaction: HClO(aq) + H2O(l) ⇌ ClO-(aq) + H3O+(aq)
The Ka of hypochlorous acid (HClO) is 3.0 x 10-8 at 25.0 °C. Calculate the pH of a 0.0335 hypochlorous acid solution.
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What scientific concept do you need to know in order to solve this problem?
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