Acids And Bases

Question 0

What is an alkali?

Answer 0

A base that is soluble in water. Not all bases are alkalis but all alkalis are bases.

Question 1

What is a base?

Answer 1

1. A substance which accepts hydrogen ions when reacting when an acid.
2. All metal oxides and metal hydroxides are bases.

Question 2

What is an advantage of using universal indicator?

Answer 2

1. Shows gradation in color changes, hence pH value of substance can be estimated by comparing color of universal indicator against color chart.
2. Other indicators only able to determine if substance above or below a fixed pH.

Question 3

Why is universal indicator not suitable for titration?

Answer 3

Universal indicator does not have sharp color change, not suitable to determine end drop neutralization point in titration

Question 4

What are the 2 ways to measure the pH of a solution?

Answer 4

1. Test with universal indicator, compare against color chart.
2. Use a pH meter.

Question 5

What is needed for dissociation of an acid to occur?

Answer 5

Water. ONLY OCCURS IN WATER.

Question 6

What is dissociation for?

Answer 6

Necessary for hydrogen ions to form.

Question 7

What is the strength of an acid referred to?

Answer 7

Degree to which an acid is able to dissociate.

Question 8

What is basicity?

Answer 8

How many hydrogen ions are dissociated per molecule of an acid.

Question 9

What is monobasic acid?

Answer 9

Substance which dissolves in water to produce maximum of 1 hydrogen ion per acid molecules dissolved.

Question 10

What is a dibasic acid?

Answer 10

Substance which dissolves in water to produce maximum of 2 hydrogen ions per acid molecule dissolved.

Question 11

What are the strength and basicity of an acid not altered by?

Answer 11

Dilution or saturation.

Question 12

What is the concentration of an acid referred to?

Answer 12

How many acid molecules are dissolved per fixed volume of water.

Question 13

What is the concentration of an acid altered by?

Answer 13

Dilution or saturation.

Question 14

What are oxides ?

Answer 14

Compounds containing oxygen and only 1 other element.

Question 15

What are neutral oxides and name a few examples.

Answer 15

1. Unable to reach with acids or bases.

2. H2O, CO, NO

Question 16

What are acidic oxides and name a few examples.

Answer 16

1. Able to react with bases only.

2. SO3,NO2,CL2O (all non metallic oxides)

Question 17

What are amphoteric oxides and name a few examples.

Answer 17

1. Able to react with both acids and bases.

2. Al2O3, PbO, ZnO

Question 18

What are basic oxides and name a few examples.

Answer 18

1. Able to react with acids only.

2. Metallic oxides.

Question 19

How do we reduce soil acidity?

Answer 19

Slaked lime.

Solid calcium hydroxide.

Question 20

How are ionic equations formed?

Answer 20

1. Identity all AQUEOUS ionic compounds.
2. Split aqueous compounds into its ions
3. Cancel out stuff that do nt contain hydrogen ions.