# Chapter 4: Acids And Redox (4.1-4.3) Flashcards

1
Q

What happens when you add a base and an acid?

A

The base neutralises the acid to form a salt and water.

2
Q

What is the ionic equation of reacting an acid with an alkali? I’m

A

H+(aq) + OH-(aq) -> H2O (l)

3
Q

How do you make a standard solution?

A

1) Weigh solid
2) Dissolve solid in distilled water below the mark
3) Transfer solution to volumetric flash (RINSE THE BEAKER WITH DISTILLED WATER)
4) Fill flask to graduation line with distilled water (AVOID PARALLAX ERROR)
5) INVERT VOLUMETRIC FLASK SEVERAL TIMES - mixes solution

4
Q

How many decimal places does a burette reading have?

A

It is measured to the nearest 0.05, so it has to be either a 0 or 5 and has to be measured to 2 decimal places.

5
Q

Describe the procedure of an acid base titration

A

4) Run the acid into the alkali until the indicator changes colour
5) Record the final burette reading
6) Quick trial titration to get approximate titre
7) Repeated accurately, adding solution dropwise we end point approaches until two accurate titres are concordant.

6
Q

How do you work out total charge of a combined atom?

A

Sum of the oxidation numbers

7
Q

How do you know the oxidation number of the ion of an element ?

A

It is the same as the ionic charge but the sign comes before the number

8
Q

What is the oxidation number of H in metal hydrides?

A

-1

9
Q

What is the oxidation number of O in peroxides?

A

-1

10
Q

What do the Roman numerals in compounds mean?

A

The oxidation number of the element you don’t know the oxidation number of.

11
Q

Describe oxidation and reduction in terms of oxygen

A

Oxidation is the addition of oxygen and reduction is removal of oxygen

12
Q

Describe oxidation and reduction in terms of electrons

A

Oxidation is losing, reduction is gaining (OIL RIG)

13
Q

Describe oxidation and reduction in terms of oxidation numbers

A

Reduction is a decreases in oxidation number but oxidation is an increase in oxidation number

14
Q

define an acid

A

a species that releases H+ ions in solution

15
Q

define strong acid

A

An acid that dissociates completely in solution

16
Q

define weak acid

A

An acid that dissociates only partially in solution

17
Q

define base

A

A compound that neutralises an acid to form a salt

18
Q

define alkali

A

A type of base that dissolves in water forming hydroxide ions, OH- (aq) ions

19
Q

define a salt

A

The product of a neutralisation reaction with an acid and a base in which the H+ ions from the acid are replaced by either ammonium or metal ions

20
Q

define a redox reaction

A

A reaction involving both oxidation and reduction

21
Q

Not reactive metal + steam

Reactive metal + water

A

1) Metal oxide + hydrogen

2) Metal hydroxide + hydrogen