Calculate the formate ion concentration and pH of a solution that is 0.050 M in formic acid %3D

Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
Publisher:Skoog
Chapter14: Principles Of Neutralization Titrations
Section: Chapter Questions
Problem 14.37QAP
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Calculate the formate ion concentration and pH of a solution that is 0.050 M in formic acid
(НСООН, Ка %3 1.8х 10+) and 0.10 м in HNO,.
Transcribed Image Text:Calculate the formate ion concentration and pH of a solution that is 0.050 M in formic acid (НСООН, Ка %3 1.8х 10+) and 0.10 м in HNO,.
Expert Solution
Step 1

 Given data :

test

  Molar concentraion of Formic Acid = 0.050 M .

  Molar concentraion of Nitric Acid = 0.10 M .

  Ka = 1.8 x 10-4 

  Formate ion concentration = ?

Step 2

 Explanation :

  • HCOOH is a weak acid and HNO3 is a strong acid, the major species in solution are H+ and HCOO-
  • The problem asks for [HCOO-] , which is formed by ionization of HCOOH.
  • Thus, the important equilibrium is The common ion in this problem is the hydrogen ion.
  • Now we can calculate the initial and equilibrium concentrations of each species involved in this equilibrium.
  • The equilibrium constant for the ionization of HCOOH =1.8 x 10-4
    Substituting the equilibrium-constant concentrations into the equilibrium expression gives :

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