Answer to Question #92685 in Biochemistry for kayley

Question #92685
What is the pH of a mixture of 5 ml of 0.1 mol/litre sodium acetate and 4 ml of 0.1 mol/litre acetic acid? (pKa of acetic acid at 25oC = 4.76). How is the pH changed on adding 1 ml of 0.1 mol/litre HCl to the above mixture? (Show your answer by means of calculation)
1
Expert's answer
2019-08-16T05:41:44-0400

HCl→H+ + Cl-


moles of CH3COOH = M*V = 0.1 mol/L * 0.004 L = 0.0004 moles

moles of CH3COO- = moles of CH3COONa = 0.1 mol/L * 0.005 L = 0.0005 moles

pKa=4.76

Ka=1.74*10-5





pH=-log10(2.175*10-5) = 4.66


Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!

Comments

No comments. Be first!

Leave a comment

Ask Your question

LATEST TUTORIALS
New on Blog
APPROVED BY CLIENTS