Acids And Bases 1

Question 1

What colour does litmus turn in the presence of

1. Acid
2. Base

Answer 1

1. Red (danger, acid)

2. Blue

Question 2

What is an indicator?

Answer 2

An indicator shows by means of a colour change whether a substance is acidic or basic

Question 3

How do you investigate the pH of a variety of materials?

Answer 3

1. Use a wide range universal indicator paper (1-14) and test a variety of chemicals, if the substance is solid dissolve it first in water
2. Choose a narrow-range paper to measure the pH more accurately
3. Summarise the results in the form of a number line