C9 Reactions Of Acids

Question 1

What pH is neutral

Answer 1

pH 7

Question 2

Difference between acids and alkalis when dissolved in water

Answer 2

• Acids release H+ ions when dissolved in water
• Alkali release OH- ions when dissolved in water

Question 3

3 methods of finding the pH of a solution

Answer 3

• Use of universal indicator
• Use of phenolphthalein
• Use of a pH prob (MOST ACCURATE as it gives exact pH)

Question 4

Metals react with acids to form ________ ______ this reaction is called a ________ _________

Answer 4

Metal Salts, Redox reaction

Question 5

What is a Base used for

Answer 5

Neutralise acids to form water in neutralisation reactions

Question 6

Describe the steps of crystallisation

Answer 6

1) Put some dilute acid into a flask and heat gently with a Bunsen burner
2) Add a small amount of base and stir
3) Keep adding the base until it doesn’t react (base is in excess)
4) Filter the solution to remove the unreacted base
5) Add the remaining solution to an evaporating dish
6) Leave in an evaporating basin in a warm area to evaporate the water so salt crystals are left behind.

Question 7

Metal + acid =

Answer 7

Salt + Hydrogen

Question 8

Metal Hydroxide + acid =

Answer 8

Salt + water

Question 9

Metal oxide + acid =

Answer 9

Salt + water

Question 10

Metal carbonate + acid =

Answer 10

Salt + water + carbon dioxide