April 2, 2015

Homework Help: Chemistry

Posted by Saira on Sunday, March 28, 2010 at 5:53pm.

IN the polystyrene beaker, mix 20mL of 0.1 M Acetic acid and 25mL of 0.1M Sodium Acetate and immediately measure the pH. Remove the electrode and add 5ml of 0.1 M HCl to this buffer. Stir the solution and measure the pH.



concentration of acetic acid= 0.1M- 20ml
concentration sodium acetate= 0.1M- 25ml
concentration of hydrochloric acid- 0.1M - 5ml

pH measured:

Buffer solution- 4.69
Buffer + 5ml 0.1M HCL- 4.43

pH calculated????????????
Buffer solution- ?????
Buffer + 5ml 0.1M HCL- ?????


1.So i have to calculate pH before the addition of HCL

2. show CALCULATIONS for calculated pH after addition of HCl

I think i use the henderson hasselbalch equation:

pH= pka+log [A-]/[HA]
pH= pka+log [0.1][0.1]

I dunt know if i plugged in the right stuff and how do i calculate pka?????

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