Quantcast
Typesetting math: 100%

Fraction dissociation for weak base

Last modified by
on
Nov 15, 2022, 1:55:42 PM
Created by
on
Jun 7, 2016, 3:57:06 AM
α=[BH+][BH+]+[B]=xF
(BH+)Base Dissociation Concentration
(F)Formal Concentration
Tags
Chemistry Analytical Chemistry Acid-base Chemistry monoprotic weak base
UUID
e6f73fac-2c63-11e6-9770-bc764e2038f2

The Fraction Dissociation for Weak Base calculator computes the fractional dissociation based on the concentration of the Base Dissociation Concentration and Formal Concentration.

INSTRUCTIONS: Choose units and enter the following:

  • [BH+] Base Dissociation Concentration
  • [F] Formal Concentration

Fraction Dissociation for Weak Base (α): The calculator returns the dissociation as a real number.

The Math / Science

The fraction dissociation for weak-base calculates the fraction (or the percentage) of weak base that has reacted with water.

The equation is created using a mass balance equation and algebraic substitution in order to simplify the number of unknowns. The mass balance equation is 

eq2.png

we can rearrange the mass balance equation to solve for [B], 

eq3.png

We can substitute this in to the fraction of dissociation equation and we get 

eq4.png

This way we only have one unknown, by letting [BH+] equal x, we get the final equation 

eq5.png

Description

The equation is 

eq1.png

where 

  • x is the concentration of the dissociated weak-base [BH+] in units of (mol/L)
  • F is the formal concentration in units of (mol/L)
  • Alpha is the fraction of dissociation (unit-less)

References

Harris, 9th Edition.  Pp.195
This equation, Fraction dissociation for weak base, is used in 1 page
  • Comments
  • Attachments
  • Stats
No comments
This site uses cookies to give you the best, most relevant experience. By continuing to browse the site you are agreeing to our use of cookies.