Problem: Hypochlorous acid, HClO, has a pKa of 7.54. What are [H3O+], pH, [ClO−], and [HClO] in 0.115 M HClO?

FREE Expert Solution

Equilibrium reaction:        HClO(aq) + H2O(l)  ClO-(aq) + H3O+(aq) 


Step 1: Construct an ICE chart for the reaction.


Step 2: Write the Ka expression and calculate for Ka.

Ka=productsreactantsKa=[ClO-][H3O+]HClO

Solids and liquids are not included in the expression

Ka=10-pKaKa=10-7.54

Ka = 2.884x10-8



Step 3: Calculate the equilibrium concentrations.

Ka=[x][x][0.115-x]2.884×10-8=x20.115-x

[HClO]initialKa>500; ignore -x

2.884×10-8(0.115)=x20.115(0.115)3.3166×10-9=x2

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Problem Details

Hypochlorous acid, HClO, has a pKa of 7.54. What are [H3O+], pH, [ClO], and [HClO] in 0.115 M HClO?

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Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.