buffer solutions?

Question

if i already have buffers prepared by using Na acetate and acetic acid, how would i adjust their pH up? down? without altering the molarity?
why?

Answer 1

to make the pH up, you can add Na acetat, and if you want tto the pH down you can add acetic acid,..because Na acetate is base and acetic acid is acid, so,the molarity will not change if you are using the Na acetat and acetic acid with the same molarity.
if you mixed two solution with the same concentration, you will get the solution wich has the same concentration before.
ex. Na acetate 0.05 M mix with 0.05 acetic acid ,(preparing buffer) so will get the buffer solution with concentration 0.05 M

Answer 2

You have to alter the molarity to change the pH. pH is just an expression of molarity of an acid. To adjust the pH of the buffer solution yo need to alter the ratio of acid to base. If you add some more of one, and do that in such a way that the volume also increases, then the molarity will remain relatively constant whilst still changing the pH.

Answer 3

Add either acetate or acid to adjust the pH, keeping track of how much you add; then calculate the total moles of solute, and add additional water to bring the solution back to the desired molarity.

Answer 4

they are correct you have to change their concn if you need to change the pH of the buffer soln....