Question

The acid-dissociation constant for hypochlorous acid (HClO) is 3.0×10−8.

Part A

Calculate the concentration of H3O+ at equilibrium if the initial concentration of HClO is 8.6×10⁻³ M .

Express your answer using two significant figures.

[H3O+] =

  M  

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Part B

Calculate the concentration of ClO− at equilibrium if the initial concentration of HClO is 8.6×10⁻³ M .

Express your answer using two significant figures.

[ClO−] =

  M  

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Part C

Calculate the concentration of HClO at equilibrium if the initial concentration of HClO is 8.6×10⁻³ M .

Express your answer using two significant figures.

[HClO] =

  M  

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Answer 1

HClO + H2O ----------------> ClO- +   H3O+

8.6×10⁻³                                             0              0

8.6×10⁻³ - x                             x               x

Ka = x^2 / 8.6×10⁻³ - x

3.0×10^-8 = x^2 / 8.6×10⁻³ - x

x = 1.605 x 10^-5

[H3O+] = 1.6 x 10^-5 M

[ClO-] = 1.6 x 10^-5 M

[HClO] = 8.6 x 10^-3 M