Acid, Bases & Salts

Question 1

Name a flammable substance

Answer 1

Deodorant

Question 2

Name a harmful/irritant substance

Answer 2

Bleach

Deodorant

Question 3

Name a corrosive substance

Answer 3

Bleach

Oven cleaner

Question 4

Name a toxic substance

Answer 4

Fertiliser

Weed killer

Question 5

Name a substance of caution

Answer 5

Fairy liquid

Bug spray

Question 6

What is the purpose of a hazard symbol? Explain the benefits

Answer 6

It has greater visual impact than words, you can take necessary safety precautions
It is universal in all languages , you can treat injuries quickly

Question 7

What is an indicator?

Answer 7

Dye which changes colour depending on whether solution it is added to is acid or alkali

Question 8

What colour does litmus paper go in acid , then alkali?

Answer 8

Red

Blue

Question 9

What colour does universal indicator go in acid or alkali?

Answer 9

Range of colours

Question 10

Give an example of 2 strong acids

Answer 10

Hydrochloric acid

Sulfuric acid

Question 11

Example of 2 weak acids

Answer 11

Ethanoic acid

Citric

Question 12

Name 2 strong alkalis

Answer 12

Potassium hydroxide

Sodium hydroxide

Question 13

Name 2 weak alkalis

Answer 13

Ammonia hydroxide

Sodium hydrogen carbonate

Question 14

What is the method for following a neutralisation reaction by monitoring the pH?

Answer 14

1. Add 15cm cubed of ammonia to a conical flask and place flask onto white tile
2. Add 8 drops of universal indicator to the ammonia
3. Record starting pH
4. Add 2cm cubed of ethanoic acid using teat Pipette, stir it and record the pH
5. Repeat step 4 until you reach a pH of 10 or more
6. Record all results in a table
7. Draw a graph of your results

Question 15

How could you make the experiment more accurate?

Answer 15

Use a pH meter, as it would give a reading to 2 decimal places

Question 16

How do we make an experiment more reliable?

Answer 16

Repeat the experiment and calculate an average