Find the pH and equilibrium concentrations of all species of a 25 M H2SO3 solution at...

Find the pH and equilibrium concentrations of all species of a 25 M H₂SO₃ solution at 25 degree C.

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Expert Solution

H2SO3 <----------------------> H+ + HSO3-

25 0 0 ---------------> initial

25-x x x ---------------> equilibrium

Ka1 = [H+][HSO3-]/[H2SO3]

Ka1 = x^2 / 25-x

1.4 x 10^-2 = x^2 / 25-x

x^2 + 1.4 x 10^-2 x - 0.35 = 0

x = 0.585

[H+] = 0.585 M

[HSO3-] = 0.585 M

pH = -log [H+]

pH = 0.233

[H2SO3 ] = 25 -0.585

[H2SO3 ] = 24.4 M

[SO3-2] = K_a2 = 6.3×10^–8

queen_honey_blossom answered 8 months ago

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