HY - Mod 6

Question 1

What is Lavoisier’s theory on acid and bases

Answer 1

Acids were substances that contained oxygen

Question 2

Limitations of Lavoisier’s theory

Answer 2

Some acids don’t have oxygen e.g. HCl
Some bases have oxygen e.g. NaOH, CaO

Question 3

What was Davy’s theory on acids and bases

Answer 3

Acids were substances that contained hydrogen that could be replaced totally or partly by metals

Question 4

Limitations of davy’s theory

Answer 4

There are acids that don’t contain hydrogen e.g. acid oxides SO2 and CO2
Also some bases have hydrogen e.g. CH4 and NH3

Question 5

What is Arrhenius’s theory on acid and bases

Answer 5

Acids were substances that ionised in solution to produce hydrogen ions and bases produced hydroxide ions. Acids were strong if they ionised almost completely and weak if they ionised only slightly.
only occurs in aqueous solutions

Question 6

Limitations of arrhenius’s theory

Answer 6

• not all acids contain hydrogen
• doesn’t account for insoluble bases that don’t release OH- ions in a solution
• Can’t explain amphiprotic oxides
• only in aqueous solutions

Question 7

What is bronsted lowry’s theory on acid and bases

Answer 7

Acids are proton donors and bases are proton acceptors

Question 8

Limitations of Bronsted Lowry theory

Answer 8

can’t explain the reaction between acid and basic oxides CoCl2
can’t do pH or strength