pH

Question 1

Define an Acid

Answer 1

any substance that is capable of donating hydrogen ions to another substance (proton donors)

Question 2

Define a base

Answer 2

any substance that is capable of accepting hydrogen ions from another substance (proton acceptors)

Question 3

What is a buffer solution

Answer 3

A buffer solution is one which resists pH changes when small volumes of acid or base are added to it

Question 4

What does acidic buffer consist of

Answer 4

consists of a solution of weak acid and one of it’s salts

Question 5

What does a basic buffer consist of

Answer 5

consists of a solution of weak base and one of it’s salts

Question 6

What effect does increasing strength of acid have on Ka value

Answer 6

increasing acid strength increases Ka value

Question 7

What is the relationship between pKa value and strength of acid

Answer 7

Large pKa value = weak acid

low pKa value = strong acid

Question 8

When is the colour change distinguishable

Answer 8

when [HIn] and [In-] differ by a factor of 10

Question 9

Where on a titration curve does the equivalence point lie

Answer 9

half way down the steepest part of the curve