Acids And Bases

Question 1

Bases

Answer 1

Soapy feel
Turns red litmus blue
Ph more than 7

Question 2

Acids examples

Answer 2

Everyday acids: lemon juice!(citric acid), rain water (carbonic acid), vinegar

Lab acids: hydrochloric acid (HCI), sulfuric acid (H2SO4)

Question 3

Base examples

Answer 3

Everyday bases: toothpaste, bleach, indigestion tablets

Lab bases: sodium hydroxide (NaOH), calcium carbonate (CaCO3), limewater Ca (OH)2

Question 4

pH scale

Answer 4

Scale which runs from 0-14, indicates the level of acidity or basicity of a substance

Question 5

Indicators

Answer 5

Substances which change colour depending on the pH of the solution in which they are placed eg. Litmus, universal

Question 6

To find pH of a substance

Answer 6

Place substance in a test tube
Add universal indicator and observe the colour change.
Compare the colour produced with the colour chart provided
This will tell you the pH of the substance

Question 7

Difference between universal indicator and litmus

Answer 7

Universal indicator can you if a substance is an acid or base and the strength of the acid or base

Litmus can only tell if a substance is an acid/base or neutral

Question 8

Acids

Answer 8

Sour taste
Sharp feel
Ph less than 7
Turn blue litmus red