Acids, alkalis and salts

Question 1

Acids (3)

Answer 1

• Acidsformacidicsolutionsin water. - Acids are sources of hydrogenions, H+.
• Acidic solutions havepHvalues less than 7.

Question 2

Alkalis (3)

Answer 2

• Alkalisformalkalinesolutions in water.
• Alkalis are sources of hydroxide ions, OH-.
• Alkaline solutions have pH values greater than 7.

Question 3

Acidic

Answer 3

Litmus paper = red
Methyl orange = red
Phenolphthalein = colourless
UI = red

Question 4

Netrual

Answer 4

Litmus paper = dark purple
Methyl orange = orange
Phenolphthalein = colourless
UI = green

Question 5

Alkaline

Answer 5

Litmus paper = blue/purple
Methyl orange = yellow
Phenolphthalein = pink
UI = purple/blue