Acids and Bases (pH scale)

Question 1

DEFINE ACIDS

Answer 1

Any substance that when dissolved in water releases hydrogen ions

Question 2

DEFINE BASES

Answer 2

A substance that can neutralise the acids by reacting with hydrogen ions

Question 3

CHARACTERISTICS OF ACIDS

Answer 3

• Contains H+1 Ions
• Conducts electricity
• Sour taste

Question 4

CHARACTERISTICS OF BASES

Answer 4

• Taste bitter
• Feels slippery
• Reacts with H+1 ions to neutralise an acid

Question 5

WHY IS ALKALI USED TO TREAT INDIGESTION

Answer 5

Akali is used to treat indigestion to counteract the acids in your stomach as an alkali is a base, and when acid and base interact they neutralise

Question 6

DIFFERENCE BETWEEN PH 4 AND PH5

Answer 6

A solution with a pH of 4 has 10 times more H+ (more acidic) than a solution with a pH of 5

Question 7

RED LITMUS PAPER

Answer 7

A pH level of 0 to 7, which is an acid will turn the litmus paper red

Question 8

BLUE LITMUS PAPER

Answer 8

A pH level of 7 to 14, which is a base will turn the litmus paper blue

Question 9

WHAT IS A PH SCALE

Answer 9

The pH scale is the measure of acidity of a substance

Question 10

EXPLAIN THE MEASUREMENT OF THE PH SCALE

Answer 10

Acid pH: An acid pH is between 0 and 7
Base pH: A base pH is between 7 and 14
‘A pH of 7 is neutral, neither acid or base’