Chapter 4 - Acids and Redox

Question 1

What is a strong acid?

Answer 1

An acid that completely dissociates in an aqueous solution. (it releases all of its H+ ions in solution)

Question 2

What is a weak acid?

Answer 2

An acid that only partially dissociates in an aqueous solution. it only releases a small amount of its available H+ ions into solution.

Question 3

What is a base?

Answer 3

A base neutralises an acid to become a salt.

Question 4

What is an alkali?

Answer 4

A base that dissolves in water and releases hydroxide ions into the solution

Question 5

Acid + alkali =

Answer 5

Salt + water

Question 6

What is a titration?

Answer 6

A technique used to accurately measure the amount of one solution that reacts exactly with another solution.

Question 7

How do you prepare a standard solution?

Answer 7

1. Weigh the solid
2. Dissolve solid in distilled water
3. Transfer solution into volumetric flask and rinse traces into flask using distilled water.
4. Add distilled water to graduation line
5. Mix solution thoroughly

Question 8

What equipment is needed for an acid - base titration?

Answer 8

A pipette and a burette

Question 9

What accuracy do you measure to when using a burette?

Answer 9

+- 0.05

Question 10

What is the oxidation number for elements?

Answer 10

Always 0, e.g H2 = 0

Question 11

How do you work out the oxidation number of a ion?

Answer 11

Sum of oxidisation numbers = total charge

Question 12

What is a redox reaction?

Answer 12

A reaction where both oxidisation and reduction happen.

Question 13

What is reduction and what is oxidation/

Answer 13

Oxidation
Is
Loss of electrons
Reduction
Is
Gain of electrons

Question 14

What is redox in terms of oxidation number?

Answer 14

Reduction is a decrease in oxidation number
Oxidation is an increase in oxidation number