Chemistry Acids +Bases

Question 1

Acid ( Arhennius)

Answer 1

A substance that dissolves in water to form H+ ions

Question 2

Base(Arhennius)

Answer 2

Substance that dissolves in water to form OH- ions

Question 3

Strong Acid + Weak Acid(Arhennius)

Answer 3

Strong: A substance that almost completely dissolves in water to form H+ ions (HCl)
Weak: A substance that only slightly dissosciates to form H+ ions (CH3COOH)

Question 4

Strong + Weak Base (Arhennius)

Answer 4

Strong: A substnace that almost completely dissociates in water to form Oh- ions (Hydroxides
Weak: A substance that only sdlightly dissosciates in water to form OH- ions (NH3)

Question 5

Limitations to Arhennius Theory

Answer 5

1) H+ ions do not exist on their own in aqueous solution
2) NH3 cannot be considered a base ( No O no OH-)
3)Arhennius definitions limited to aqueuous solutions

Question 6

Conjugate Acid-Base Pair

Answer 6

Any pair consisting of an acid and a base that differ by a proton
e.g
-An acid forms a conjugate base after it has donated a proton
-A base forms a conjugate acid after it has accepted a proton

Question 7

Rules for acid to conjugate base

Answer 7

Decrease h by 1
Decrease charge by 1

Question 8

Relative strength of acids and bases

Answer 8

-A strong acid has a weak conjugate base
- A weak acid has a strong conjugate base

Question 9

Neutralisation

Answer 9

A reaction between an acid and a base forming salt and water
Eg(NaOH +HCL – NaCl + H20

Question 10

Salt

Answer 10

Substance formed when a H+ ion from an acid is replaced by a metal or ammonium ion