Question

What is the hydronium ion concentration of a 0.100 M hypochlorous acid solution with Ka = 3.5 x 10^-8? The equation for the dissociation of hypochlorous acid is: HOCl(aq) + H2O(l) ⇌ H3O+(aq) + OCl-(aq). Group of answer choices: 5.9 × 10^-4 M 1.9 × 10^-5 M 1.9 × 10^-4 M 5.9 × 10^-5 M

          What is the hydronium ion concentration of a 0.100 M hypochlorous acid solution with Ka = 3.5 x 10^-8? The equation for the dissociation of hypochlorous acid is: HOCl(aq) + H2O(l) ⇌ H3O+(aq) + OCl-(aq).

Group of answer choices:
5.9 × 10^-4 M
1.9 × 10^-5 M
1.9 × 10^-4 M
5.9 × 10^-5 M
        
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Added by Steven M.

Chemistry: Structure and Properties
Chemistry: Structure and Properties
Nivaldo Tro 2nd Edition
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What is the hydronium ion concentration of a 0.100 M hypochlorous acid solution with Ka = 3.5 x 10^-8? The equation for the dissociation of hypochlorous acid is: HOCl(aq) + H2O(l) ⇌ H3O+(aq) + OCl-(aq). Group of answer choices: 5.9 × 10^-4 M 1.9 × 10^-5 M 1.9 × 10^-4 M 5.9 × 10^-5 M
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Transcript

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00:01 A weak acid, such as hypochlorous acid, dissociates partially in accusolution according to this balanced chemical equilibrium equation.
00:10 As this is an equilibrium reaction, we can represent an equilibrium constant, which is the ratio of the equilibrium concentration of the product to that of the equilibrium concentrations of the reactant.
00:21 So in this case, since we're working with the acid, the equilibrium concept is in the form of ca, which is called the acid dissociation constant, and is equal to the product of the equilibrium.
00:30 Concentration of the product ions that's h3o plus and ocel minus over the concentration of the acid itself at equilibrium so we don't include h2o since this is in a liquid state so only those that are in accus and gas state will be shown in the equilibrium constant expression so this ka is called as the acid dissociation constant and the value of which tells us the extent or by which the acid dissociation us its strength.
01:02 So in this case we want to find the hydrogenium ion concentration for a 0 .1 molar hypochlorous acid solution given also that the k a of the acid at a certain temperature is 3 .5 times 10 to the negative 8...
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