Purchase Solution

PH / buffer; required salt acid ratio

Not what you're looking for?

Ask Custom Question

For 500 ml of solution of .5M acetic acid at pH 4.6, how many moles of HCl (assume no volume change) would have to be added to get the salt to acid ratio as 1/8?
pKa of acetic acid is 4.76.

Purchase this Solution

Solution Summary

The solution solves for the proper amount of HCl to be added to a buffer solution to achieve a required salt acid ratio.

Solution Preview

Your question relates to buffers, or solutions which resist changes in pH. Buffers are often used in biochemistry and chemistry and typically are made with a weak acid (only partially dissociates in water) and a soluble salt containing the acid's conjugate base. There are literally hundreds of different buffer systems; each buffer is most useful in the pH range at or close to a value known as the pKa. This is the negative Log (base 10) of the Ka, which is the dissociation constant for the weak acid. In order to calculate pH values of buffers or the amounts of each constituent required for a specific buffer, we need to know the pKa.

The solutions to your questions involve the Henderson-Hasselbalch (H-H) equation (for a derivation of this equation plug ...

Purchase this Solution

Free BrainMass Quizzes

The quiz helps in revising basic concepts about thermochemistry.

General Chemistry - Classification of Matter

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

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.

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.