Acids and alkalis

Question 1

All solutions in water are what?

Answer 1

Acids, alkaline, or neutral

Question 2

Which is a good indicator to tell acids and alkalis apart?

Answer 2

Litmus is a good indicator which turns red in acidic solution and blue in alkaline solution

Question 3

What is the pH scale?

Answer 3

pH scale measures how acidic or alkaline a solution is, runs from 0-14 and above

Question 4

On the pH scale, which numbers are acids, alkalis and neutral?

Answer 4

0-6 = acids
7 = neutral
8-14 = alkali

Question 5

What is a universal indicator?

Answer 5

Universal indicator is mixture of indicators that has range of colours depending on pH of solution

Question 6

Which acids are used in the laboratory?

Answer 6

Acids used in laboratory are: HCL, sulphuric acid, nitric acid

Question 7

What are some alkalis used in the laboratory?

Answer 7

Alkalis used in laboratory are: sodium hydroxide, potassium hydroxide, ammonia

Question 8

What is neutralisation?

Answer 8

Neutralisation is a process when the same amount of an acid and alkali is added into a solution, cancelling each other out and neutral solution can be formed

Question 9

What is titration?

Answer 9

Titration is method to investigate concentration of acidic and alkaline solutions

Question 10

Give an example of neutralisation.

Answer 10

wasp sting (alkaline) can be neutralised by vinegar (acid)