Formic acid (HCO2H) has a dissociation constant of 1.8 _ 104 M. The acid dissociates 1:1. What is the [H+] if 0.1 mole of formic acid is dissolved in 1.0 liter of water? Use a scientific calculator.

0.9 _ 10^-3 M

4.2 _ 10^-3 M

7.9 _ 10^-3 M

15 _ 10^-4 M

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Ruffles

28 February, 15:45

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America Burch · Answer 1

Use the equation for Ka = > 1.8 x 10 ^ (-4) = [H+][HCO2-}, these 2 concentrations are equal so,

1.8 x 10 ^ (-4) = [H+]^2

and [H+] = 4.2 * 10^-3 M

Formic acid (HCO2H) has a dissociation constant of 1.8 _ 104 M. The acid dissociates 1:1. What is the [H+] if 0.1 mole of formic acid is dissolved in 1.0 liter of water? Use a scientific calculator.0.9 _ 10^-3 M4.2 _ 10^-3 M7.9 _ 10^-3 M15 _ 10^-4 M