Purchase Solution

Calculating pH, Ka, grams, and amounts of an acid for making a buffer

Not what you're looking for?

Ask Custom Question

1. Calculate the pH of a solution which is 0.428 M in oxalic acid and 1.44 M in oxalate.

2. What is the pH of a solution that is 45.5 mM in acetic acid and 1.11 M in acetate?

3. A solution which is 3.19X10 to the -3 M in an acid (HA) and 6.78x10 to the -3 M in its conjugate base (A-) is found to have a pH of 8.65. What is the Ka of the acid?

4. Calculate the number of grams of NaH2PO4 (MW=120.0) and the number of grams of Na2HPO4 (MW=142.0) that should be weighed out and dissolved to 1 L to give a 100 mM solution in total phosphate at pH=7.50.

5. Calculate the amounts of formic acid and formate that must be used to make 1 L of buffer at pH= 3.80 and that is 250 mM in total formic acid / formate.

Purchase this Solution

Solution Summary

This solution is provided in 805 words in an attached .doc file. It describes buffers and buffer systems, as well as pKa and the Hendersen-Hasselbalch equation.

Purchase this Solution

Free BrainMass Quizzes

Basics in biology

BioChemistry Basics

This Quiz will test your knowledge of the amino acids used in biological systems

Bacterial Genetics

This quiz test your knowledge of the genetics of bacteria.

Basic Concepts in Neuroscience

This quiz provides a review of the basic concepts in neuroscience.

How Much Do You Know About Genetic Inheritance?

Most of us studied the basics of dominant and recessive genes at some point. However, genetics are much more complicated than this. How far beyond the basics does your knowledge go?