lecture 2

Question 1

what is the dissociation constant for water?

Answer 1

it expresses the relationship between the [H+], [OH-], and [H2O] at equilibrium

Question 2

pH of blood is 7.4, going from 6 to 7 is a how much change in proton concentration?

Answer 2

10 fold change

Question 3

What does Ka (dissociation constant) tell us?

Answer 3

it tells us the tendency of the acid to dissociate and donate a hydrogen ion to solution and so the higher the Ka the greater the tendency to dissociate the proton

Question 4

what does pKa reflect? So, what does that mean if the pKa of an acid 2 versus 5?

Answer 4

strength of the acid; it is much stronger, so a greater proportion would be dissociated.

Question 5

Calculate the pH of 1.00L of the buffer 1.00M CH3COONa and 1.00M CH3COOH. Ka=4.2x10-7
A)Initially
B)after the addition of 0.080 mol NaOH
C) after the addition of 0.120 mol HCl

Answer 5

refer to aids