Chapter 4 Understanding Acid-Base Properties

Question 1

Who was the first person to outline the characteristics of acid and bases?

Answer 1

Robert Boyle

Question 2

What properties did Robert Boyle state that acid and bases had?

Answer 2

Acids
-Sour taste
-Corrosive to metal
-Change colour of certain vegies dyes
- Litmus blue to red

Base (Boyle used the term alkalis)
-Slippery
-Litmus red to blue

Question 3

What does Arrhenius’s theory state about acids and bases?

Answer 3

-An acid is a substance that will ionise in a solution producing H+ ions
-A base is a substance that will dissociate in a solution producing OH- ions

Question 4

According to Arrhenius, what is a strong acid?

Answer 4

A substance that completely ionises in water

Question 5

In terms of ionisation and weak/strong acids and Arrhenius’s theory, what does a single arrow and a double arrow indicate about the strength of the acids?

Answer 5

A single arrow is used to show complete ionisation that is a strong acid.
A double arrow indicates partial ionisation that is a weak acid

Question 6

According to Arrhenius, what is a weak acid?

Answer 6

A substance that partially ionises in water

Question 7

What is Arrhenius’s theory limited to?

Answer 7

It only limited to acid-base behaviour in aqueous solutions

Question 8

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