Indicators And Buffers

Question 0

What is a buffer solution?

Answer 0

One in which the pH remains approximately constant when small amounts of acid/base are added?

Question 1

What is KIn? And using this how do you find pH?

Answer 1

The acid dissociation constant for an indicator HIn.
KIn = [H^+][In^-] ➗ [HIn]
pH = pKIn +log([In^-]➗[HIn^-])

Question 2

What are the two types of buffer solutions ?

Answer 2

1) an acid buffer consists of a sol of a weak acid and one of its salts
2) a basic buffer consists of a sol of a weak base and one of its salts

Question 3

What is the stable pH of the buffers due to (for both types)?

Answer 3

Acid- the weak acid which provides hydrogen ions to trap added hydroxide ions, the salt of this acid which provides A^- to trap added hydrogen ions.
Base- the weak base which can trap added hydrogen ions, the salt of the base which can trap added hydroxide ions

Question 4

What does pH =

Answer 4

pH = pKa - log ([acid] ➗ [salt])