2.1.4 Acids

Question 1

What is an acid?

Answer 1

Proton donator

Question 2

What is a strong acid?

Answer 2

Completely dissociates in aqueous solution and releases lots of H+

Question 3

What is a weak acid?

Answer 3

Partially dissociates in aqueous solution and releases little of H+

Question 4

What is a base?

Answer 4

Proton acceptor

Question 5

What is a strong base?

Answer 5

Completely dissociates in aqueous solution and releases lots of OH-

Question 6

What is a weak base?

Answer 6

Partially dissociates in aqueous solution and releases little of OH-

Question 7

What is an alkali?

Answer 7

A base that dissolves in water releasing OH-

Question 8

What is neutralisation?

Answer 8

H+ and OH- to form H20

Question 9

How are salts named after a neutralisation reaction?

Answer 9

Metal of base then non- metal of acid

Question 10

Metal + acid –>

Answer 10

Salt + Hydrogen

Question 11

Metal hydroxide + acid –>

Answer 11

Salt + Water

Question 12

Metal oxide + acid –>

Answer 12

Salt + water

Question 13

Metal carbonate + acid –>

Answer 13

Salt + Carbon Dioxide + Water

Question 14

What is a titration?

Answer 14

Technique to measure vol of a solution that fully reacts with another

Question 15

What 2 indicators are used in titrations? Colour changes?

Answer 15

1. Phenolphthalein (phenol-ph-tha-lein)
   Acid = colourless
   Alkali = pink
2. Methyl Orange
   Acid = Yellow
   Alkali = red

Question 16

How do you record results of a burette? (3)

Answer 16

• 2 decimal places
• Bottom of meniscus
• Read to nearest 0.05cm3

Question 17

Method for making a standard solution?

Answer 17

1. Weigh solid- weighing boat
2. Into beaker, washing boat with deion. water
3. Dissolve into water- stir
4. Into volumetric flask, wask everything that had contact
5. Add deion. water until graduation line
6. Invert

Question 18

What is a titre?

Answer 18

Precise vol. of solution needed to neutralise acid/ alkali

Question 19

What’s important to remember when doing mean titres?

Answer 19

Only use titre volumes wihtin 0.10cm3

Discard any others

Question 20

What’s the sort of calc. related to this topic? (4)

Answer 20

1. m = n x mr
2. n = c x v
3. Stoichiometry
4. Converting units for equations