answersLogoWhite

0

Chemistry
Acids and Bases
Mathematical Constants

How do you calculate a dissociation constant?


Top Answer
User Avatar
Wiki User
Answered 2007-11-28 02:08:27

Determination of the Dissociation Constant and Molar Mass for a Weak Acid

Abstract: We will determine Ka and the molar mass for an unknown weak acid by using a pH meter to record the pH at intervals during the titration with sodium hydroxide. The titration curve and its first derivative will be plotted to establish the equivalence point. Introduction The strength of an acid is defined by its ability to donate a proton to a base. For many common acids, we can quantify acid strength by expressing it as the equilibrium constant for the reaction in which the acid donates a proton to the standard base, water, as shown in the equations below: HA + H2O Û H3O+ + A-, for H3CCOOH: H3CCOOH + H2O Û H3O+ + H3CCOO - The equilibrium constant for a reaction of this type is called the Acid Dissociation Constant, "Ka", for the acid HA Determination of the Dissociation Constant and Molar Mass for a Weak Acid

Abstract: We will determine Ka and the molar mass for an unknown weak acid by using a pH meter to record the pH at intervals during the titration with sodium hydroxide. The titration curve and its first derivative will be plotted to establish the equivalence point. Introduction The strength of an acid is defined by its ability to donate a proton to a base. For many common acids, we can quantify acid strength by expressing it as the equilibrium constant for the reaction in which the acid donates a proton to the standard base, water, as shown in the equations below: HA + H2O Û H3O+ + A-, for H3CCOOH: H3CCOOH + H2O Û H3O+ + H3CCOO - The equilibrium constant for a reaction of this type is called the Acid Dissociation Constant, "Ka", for the acid HA Determination of the Dissociation Constant and Molar Mass for a Weak Acid

Abstract: We will determine Ka and the molar mass for an unknown weak acid by using a pH meter to record the pH at intervals during the titration with sodium hydroxide. The titration curve and its first derivative will be plotted to establish the equivalence point. Introduction The strength of an acid is defined by its ability to donate a proton to a base. For many common acids, we can quantify acid strength by expressing it as the equilibrium constant for the reaction in which the acid donates a proton to the standard base, water, as shown in the equations below: HA + H2O Û H3O+ + A-, for H3CCOOH: H3CCOOH + H2O Û H3O+ + H3CCOO - The equilibrium constant for a reaction of this type is called the Acid Dissociation Constant, "Ka", for the acid HA

001
๐Ÿ™
0
๐Ÿคจ
0
๐Ÿ˜ฎ
0
๐Ÿ˜‚
0
User Avatar

Your Answer

Loading...

Still have questions?

Related Questions

What is the dissociation constant of an acid?

The strength of an acid or the measure of its tendency to release proton ions (H+) can be indicated from its dissociation constant which is called Ka. The acid dissociation constant, pKa , is the negative logarithm of dissociation constant (Ka).


What is the difference between dissociation constant and equilibrium constant?

for the weak acids ,the dissociation constant, and the equilibrium constant are one and the same.


What is the dissociation constant k of pure water?

The dissociation constant of pure water is 1.9E-5.


What is an acid dissociation constant?

An acid dissociation constant is the equilibrium constant for the disassociation of an acid, ultimately a measure of the acid's strength.


Ph value of sodium hydrogen carbonate?

Alkaline, but you need to know the concentration and the dissociation constant to calculate pH


What is the acid dissociation constant for an acid at equilibrium HX H X?

The dissociation constant is:k = [H][X]/[HX]


What is the formula to calculate the pH of a weak acid?

PH= .5 ( pka + pca)as pka represents dissociation constant of weak acid


Which base has the smallest base dissociation constant?

The base that has the smallest base dissociation constant is ammonia. It is a weak base and would ionize the least.


What is dissociation constant of ethanol?

the pKs is 18.


The acid dissociation constant for an acid dissolved in water is equal to?

equilibrium constant


What is dissociation constant for adipic acid?

The dissociation constant is 3.715 x 10-5 for the first step and 3.89 x 10-6 for the second step.


Factors affecting dissociation constant of acid?

Temperature


What does the abbreviation Ka represent?

Acid dissociation constant


The abbreviation Ka represents?

acid dissociation constant


What is KB in chemistry?

kb is the Dissociation Constant for Bases.


What dictates how electrolytic an electrolyte is in solution?

This is the dissociation constant.


What is base dissociation constant?

a base dissociation constant is the rate of the equilibrium that is reached when a weak base is added to water, producing it's conjugate acid and hydroxide ions.


What is the dissociation constant for methyl orange?

Methyl orange is also known as H + In -. Its dissociation constant for its ionic strength is 0.1 mol I-1 in water, at 25 degrees Celsius.


Which acid has the greatest acid dissociation constant?

nitric acid.


Which of the following is a property of strong acids?

A high constant of dissociation.


Does inorganic acids has higher dissociation constant then organic acids?

yes


Ratio of the concentration of the dissociated to the undissociated form?

acid dissociation constant


The acid dissociation constant for an acid dissolved in water is equal to the?

Z


Why HCN acid a weak acid?

Constant of Dissociation Kk are lowest.


Does pka changes with temperature?

pKa (dissociation constant) is variable with temperature.