Problem: A student planned an experiment that would use 0.10 M propionic acid (HC3H5O2 , Ka = 1.4 × 10–5). Calculate the equilibrium concentration of the hydrogen ion in this solution.A. 2.4 ×10–3 M B. 8.3 × 10–12 M C. 1.2 × 10–3 M D. 5.0 × 10–4 ME. 1.2 × 10–7 M

FREE Expert Solution

We’re being asked to calculate the concetnration of H+ of a 0.1 M propionioc acid 


HC3H5O2 is a weak acid that will further react in water to form H3O+

HC3H5O2 (aq) + H2O (l) → H3O+ (aq) + C3H5O2- (aq)


We can use the H3O+ produced to find the pH

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Problem Details

A student planned an experiment that would use 0.10 M propionic acid (HC3H5O2 , Ka = 1.4 × 10–5). Calculate the equilibrium concentration of the hydrogen ion in this solution.

A. 2.4 ×10–3

B. 8.3 × 10–12

C. 1.2 × 10–3

D. 5.0 × 10–4 M

E. 1.2 × 10–7 M

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