# Biochemistry-pH Buffers

## Biochemistry-pH Buffers

Hi,

I'm a bit confused as to how to solve this problem.

1. Calculate the amount of 0.5 M lactic acid/1.0M lactate you would need to make a 3.3M M100 mL solution with the pH of 4.80 and the pKa is 3. 9.

First you would use the equation .5M x (Y)= 3.3 M x (100mL)

that gives you 660 mL which is impossible since you have to make it 100mL?

Thanks,

Gina

I'm a bit confused as to how to solve this problem.

1. Calculate the amount of 0.5 M lactic acid/1.0M lactate you would need to make a 3.3M M100 mL solution with the pH of 4.80 and the pKa is 3. 9.

First you would use the equation .5M x (Y)= 3.3 M x (100mL)

that gives you 660 mL which is impossible since you have to make it 100mL?

Thanks,

Gina

**greenpak07**- Student
- Posts : 6

Join date : 2008-12-01

## Re: Biochemistry-pH Buffers

Hi Gina,

You are right; it is not possible to make 100ml of 3.3M solution out of 0.5M one. However, I would suggest you double check the problem - I think that

"3.3M M100 mL solution " was supposed to be 3.3 mM 100ml solution - then everything makes sense.

You are right; it is not possible to make 100ml of 3.3M solution out of 0.5M one. However, I would suggest you double check the problem - I think that

"3.3M M100 mL solution " was supposed to be 3.3 mM 100ml solution - then everything makes sense.

**Alla**- Instructor
- Posts : 103

Join date : 2008-02-27

Page

**1**of**1****Permissions in this forum:**

**cannot**reply to topics in this forum