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neonofarm [45]
3 years ago
15

Formic acid (HCO2H) has a dissociation constant of 1.8 x 10^-4 M. The acid dissociates 1:1. What is the [H+] if 0.35 mole of for

mic acid is dissolved in 1.0 liter of water?

Chemistry
1 answer:
Tju [1.3M]3 years ago
7 0
Initial [ HCO2H] = moles * volume 
                           =0.35 moles * 1 L = 0.35 M

by using ICE table:

              HCO2H ↔ H+  + HCO2-
initial      0.35 M        0          0
change  - X             +X          +X
Equ       (0.35 - X)       X          X

∴ Ka = [H+][HCO2-] / [HCO2H]

by substitution:

1.8 x 10^-4 =  X^2 / (0.35-X) by solving for X

∴ X = 0.0079 or 7.9 x 10^-3

∴ [H+] = X = 7.9 x 10^-3 M
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Answer:

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In:     0.001       0.002           -

R:       x                 x                2x

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x = 0.00187/2 = 9.35×10⁻⁴ moles that have reacted

So in the equilibrium we have:

0.001 - 9.35×10⁻⁴ = 6.5×10⁻⁵  moles of H₂

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Explanation:

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