Acids and bases

Question 1

What is Arrhenius definition of a base

Answer 1

A substance that dissociates in water to produce OH- ions

Question 2

Why is NH3 considered to be a base according to bronstead lowery theory

Answer 2

It is a base because it accepts aa proton

Question 3

Define a conjugate acid- base pair.

Answer 3

2 species that differ by 1 proton.

Question 4

Distinguish between a strong acid and a weak acid

Answer 4

A strong acid is once which does dissociate fully in water and a weak acid is one what does not dissociate fully in water

Question 5

Arrhenius theory of acid and base

Answer 5

An acid is a substance that dissolves fully in water to form H+ ions
A base is a substance that dissociates fully in water to create OH- ion.

Question 6

Define amphotermic

Answer 6

Any substance that can act as both an acid and a base

Question 7

Color change for a strong acid and strong base

Answer 7

Any indicator

Question 8

Indicator for strong acid weak base

Answer 8

Methyl orange

Question 9

Indicator for weak acid strong base

Answer 9

Phenophthaleone

Question 10

Indicator for weak acid weak base

Answer 10

None

Question 11

What is a standard solution

Answer 11

Standard solution is one whose concentration is known accurately

Question 12

Define primary standard

Answer 12

Is one that can be made up directly using a measured amount of pure solid to give a solution of exactly known concentration

Question 13

What must a substance be to be suitable for use as a primary standard

Answer 13

Pure.
Very soluble
Have a high molecular mass

Question 14

Define secondary standard

Answer 14

Make up a solution and then standardize this solution using a primary standard.

Question 15

Define standardize

Answer 15

Find the concentration of using titration

Question 16

Why cant you use MNO as a primary standard

Answer 16

It cannot be got sure

Question 17

Why can you not use iodine as a primary standard

Answer 17

It sublimes