C3.3.2 - The pH Scale

Question 1

What is an acid?

Answer 1

An acid is a substance that releases Hydrogen ions (H+,aq) when dissolved in water

Question 2

What is formed when acid is dissolved in water?

Answer 2

An aqueous solution

Question 3

What is a base?

Answer 3

A substance that can neutralise acids

Question 4

What is an alkali?

Answer 4

A base which can dissolve into water

Question 5

What does alkali release when dissolved in water?

Answer 5

OH- ions

Question 6

What pH do acids have?

Answer 6

pH < 7

Question 7

What pH do alkaline have?

Answer 7

pH > 7

Question 8

What pH is neutral?

Answer 8

7

Question 9

What can you use to show the pH of a solution?

Answer 9

Universal indicator, pH meter

Question 10

Write a method on how you would measure pH using a pH meter.

Answer 10

1) Wash the pH with probe with water, and then put it into the calibration buffer.
2) Adjust the reading to match the pH of the buffer solution
3) Wash the pH meter with water
4) Place the pH meter into the solution and then take the reading