Purchase Solution

Calculate pH and % Ionization from Ka

Not what you're looking for?

Ask Custom Question

I'm given the Ka and concentration to calculate the pH then find % ionization. I utilized an ice table and made the assumption that x << the # i'm working with, however, when I check the assumption... its not < 5% snd plugged my #'s into the quadratic formula and both #'s check... when one # is usually eliminated and I'm left with the correct x value. I've checked my calcultions numerous times and am simply lost. I'm working with trichloroacetic acid and am assuming it is a weak acid and does not completely dissociate. Is this where I'm going wrong?

Purchase this Solution
Solution Summary

This solution explains how to calculate the pH and the percent ionization of trifluoroacetic acid based on an initial concentration and Ka.

Solution Preview

Please see the attached file for the complete solution.
Thanks for using BrainMass.

The equilibrium expression can be written as:

You know the Ka and the concentration of HA. Because the Ka is only 0.23, you can't neglect the x term ...

Purchase this Solution
Free BrainMass Quizzes
Periodic table

Match Elements with their Symbols

Elements are provided: choose the matching one- or two-letter symbol for each element.

General Chemistry - Classification of Matter

This test will assess your knowledge on the classification of matter which includes elements, compounds and mixtures.

Functional groups in Organic Chemistry

You will be tested on the names of functional groups in Organic Chemistry. It is very important to know the functional groups to understand Organic reactions.

Organic Chemistry Naming: Alkanes

This is a quiz which is designed to assist students with learning the nomenclature used to identify organic compounds. This quiz focuses on the organic compounds called Alkanes.

View More Free Quizzes
Related BrainMass Solutions

  • Calculating Ka of Acetic Acid

    Using the equation pKa= -log Ka, calculate the Ka from the pH value and the starting acetic acid concentration. 2.

  • pH And Percent Ionization

    534862 pH and Percent Ionization 1. Determine the pH and the percent ionization in a 0.50M solution of KOBr. The Ka for HOBr = 2.5 x 10 ^ -9. 2.

  • Chemistry Calculations and Concepts

    acetic acid from the measured pH of acetic acid samples: Acetic Acid titrated with Sodium Hydroxide and the following was determined or known before experiment: Avg. molar concentration of acetic acid titrated = 0.0455 mol/L Avg. pH = 3.19 Standardized

  • The pH level for saturated water

    I worked out these steps as they are written, but you need to follow them in a-b-c-d order: d) To calculate the pH you need the [H+] concentration (pH = -log[H+]) c) We assume that the [H+] is entirely from dissociation of H2CO3 (none from H2O dissociation

  • Questions on Acids and Bases

    Calculate the percent ionization of HA in a 0.10 M solution. Express your answer to two significant figures and include the appropriate units. Calculate the percent ionization of HA in a 0.010 M solution.

  • pH of solution

    Calculate the pH of a 0.055 M solution of the following compounds A.) NH3. Kb(NH3) = 1.7E-5. B.) HClO. Ka(HClO) = 4.0E-8. C.) HCN. Ka(HCN) = 6.2E-10. 24.)

  • Calculating pH

    the undissociated acid and Cx moles/litre each of H+ and A-

    the equilibrium constant for the ionization process is given by,

    Ka = [H+] [A-]/[HA] = (C x C x)/[C(1-x)] = [H3O+][CH3COO-]/[CH3COOH]

    Ka = x^2 C/(1-x)

  • the pH of CO2 saturated water

    Furthermore, the ionization constant, Ka, for H2CO3 has a value of 4.5E-7 mol L-1 at this temperature. Please see the attached file for detailed solution. The solution explains how to calculate the pH of CO2 saturated water in detail.

  • Equilibrium and Acid - Base Reactions

    Now, we are ready to calculate the percent ionization. 2, Assume an indicator, HA, has a Ka od exactly 10^-7. This means that at pH = 7 there are equal numbers of molecules of both colors.

View More Related Solutions