Buffer ratios. HEEELP!?

Question

I'm writing up a chem report relating to buffer systems and I need some confirmation on two questions.

1. Calculate the buffer ratio for each of these buffer solutions:

Buffer A = 20mL 0.1M CH3COONa AND 2mL 0.1M CH3COOH

Buffer B = 2mL 0.1M CH2COOH AND 20mL 0.1M CH3COONa

2. Briefly explain the significance of the buffer ratio

Thanks in advance ;)

Answer 1

To quickly calculate the buffer ratio use this equation

M1V1 : M2V2

M1 is the molarity

V1 is the volume (it can be any units as long as both units are the same for both sides)

for

Buffer A

20(.1): 2(.1)

=

2:.2

=

20:2

=10:1

you can do Buffer B by yourself

the importance of the ratio in a buffer solution is that you want a 1:1 ratio that is the point where you can add the most acid or base with the least amount of change to the pH

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