Acids

Question 1

What is a acid?

Answer 1

Substance with a pH of less than 7
Form H+ ions in water
The higher the concentration of hydrogen ions in a solution, the more acidic it is - lower its pH it will be

Question 2

What is a base?

Answer 2

Substance that reacts with an acid to produce salt and water

Question 3

What is a alkali?

Answer 3

Base that is soluble in water and have a pH more than 7 and form OH- (hydroxide ions) in water
The higher the concentration of OH- ions in a solution, the higher the pH

Question 4

What is a pH scale?

Answer 4

Used to show how acidic or alkaline a solution is.

Question 5

What is the pH for most acids and Alkali and netural?

Answer 5

Acids - Below 7
Alkali - Above7
Neutral is 7

Question 6

What colour is Litmus in Acidic, Neutral and Alkaline solutions?

Answer 6

Red - Acidic
Purple - Neutral
Blue - Alkaline

Question 7

What colour is methyl orange in Acidic, Neutral and Alkaline solutions?

Answer 7

Red - Acidic

Yellow - Neutral and Alkaline

Question 8

What colour is phenolphthalein in Acidic, Neutral and Alkaline solutions?

Answer 8

Colourless - Acidic and Neutral

Pink - Alkaline

Question 9

What factor does hydrogen ion concentration in a solution increases by?

Answer 9

Factor of 10 and the pH of the solution decreases by 1
eg For example
An acid of pH 2 has 10 times more H+ ions in solution than an acid of pH 3.
An acid of pH 3 would thus have 10 x 10 = 100 times more H+ ions in solution than an acid of pH 5.