Acid Reactions

Mrs HOU

Year 9

Acid

Sour !Damage of Acid Rain

Why acid cause damage?

Corrosive

Low pH

Reacts with metal, carbonate, base.

DON’T TASTE ANY ACID IN THE LAB !!!!

Acid with Metal

Demonstration

HCl and Aluminum

The beaker will be covered by balloon.

What will happen to the balloon

when I mixed them ?

Acid with MetalAcid + Metal Salt + Hydrogen Gas

Hydrochloride acid + Magnesium Magnesium Chloride + Hydrogen gas

HCl + Mg MgCl2 + H2

2HCl + Mg MgCl2 + H2

Hydrochloride acid + Aluminium Aluminum Chloride + Hydrogen gas

6HCl + 2Al 2AlCl3 +3 H2

6HCl + 2Al 2AlCl3 +3 H2

But Acid doesn’t react with all metals

Zinc

Aluminum

Magnesium

Copper

Most Active

Least Active

Acid with Metal carbonate

Carbonate is A salt of carbonic acid H2CO3,

characterized by the presence of the carbonate ion, CO3

2-. For example: CaCO3,

Na2CO3, MgCO3

Marble (CaCl2) Soda Water (Na2CO3) Drying agent (MgCO3)

Acid with Metal Carbonate

HCl and Baking Soda

The beaker will be covered by balloon.

What will happen to the balloon

when I mixed them ?

What is the gas produced?

Acid with Metal Carbonate

Acid + Carbonate Salt + Water + Carbon Dioxide

Hydrochloride acid + Calcium Carbonate Calcium Chloride+ Water +Carbon Dioxide

HCl+ CaCO3 CaCl2 + H2O +CO2

2HCl+ CaCO3 CaCl2 + H2O +CO2

Acid with Metal hydrogen carbonate

What is hydrogen carbonate: A salt of carbonic acid H2CO3, characterized by the presence of the carbonate ion, HCO3

-. For example: Ca(HCO3)2, NaHCO3,

Acid with Metal hydrogen carbonate

Acid + Hydrogen Carbonate Salt + Water + Carbon Dioxide

Hydrochloric acid + calcium hydrogen carbonate Calcium Chloride+ Water +Carbon Dioxide

HCl+ Ca(HCO3)2 CaCl2 + H2O +CO2

2HCl+ Ca(HCO3)2 CaCl2 + 2H2O +2CO2

Your Answer Sheet

You will now have time to do the worksheet about writing the chemical equations.

Quiet work ONLY

The game activity will be based on your performance.