Acids & Bases

Question 1

Brønsted-Lowry Base

Answer 1

A species that accepts H+ ions

Question 2

H3O+ ion

Answer 2

Oxonium ion (also known as hydronium ion)

Question 3

Kw

Answer 3

The ionic product of water

Question 4

Brønsted-Lowry Acid

Answer 4

A species that donates H+ ions

Question 5

pH

Answer 5

-log10 [H+(aq)]

Question 6

Neutrality

Answer 6

Where [H+] = [OH-]

not pH 7

Question 7

Strong Acid

Answer 7

Acids that completely dissociate in aqueous solution

Question 8

Weak Acids

Answer 8

Acids that only partially dissociate in aqueous solution

Question 9

Ka

Answer 9

Acid dissociation constant

Question 10

pKa

Answer 10

-log10(Ka)

Question 11

Equivalence Point

Answer 11

The volume at which exactly the same moles of H+ ions (or OH- ions) are added as there are moles of OH- ions (or H+ ions) in the solution.

Question 12

End Point

Answer 12

The volume of acid/alkali added when the indicator just changes colour.

Question 13

Name Indicators for Weak Acid/Strong Base Titrations

Answer 13

• Phenolphthalein

- Bromothymol Blue

Question 14

Name Indicators for Strong Acid/Weak Base Titrations

Answer 14

• Methyl Orange
• Methyl Red
• Bromophenol Blue

Question 15

Half-Neutralisation Point

Answer 15

The half way point between zero and the equivalence point

[HA]=[A-]

Question 16

Buffers

Answer 16

Solutions that resist large changes in pH on the addition of small amounts of acid or alkali

Question 17

Acidic Buffer

Answer 17

A buffer made from a mixture of a weak acid and a soluble salt of that acid

Question 18

Saturate a Buffer

Answer 18

When so much acid or alkali is added to a buffer that all of the available HA or A- is used up