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UNIT IV Acid Rain. M ETAL O XIDES Metal Oxides (or Basic Anhydrides) act as BASES in solution. Group 1 and Group 2 Oxides are ionic. They dissociate to.

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Presentation on theme: "UNIT IV Acid Rain. M ETAL O XIDES Metal Oxides (or Basic Anhydrides) act as BASES in solution. Group 1 and Group 2 Oxides are ionic. They dissociate to."— Presentation transcript:

1 UNIT IV Acid Rain

2 M ETAL O XIDES Metal Oxides (or Basic Anhydrides) act as BASES in solution. Group 1 and Group 2 Oxides are ionic. They dissociate to form the oxide ion (O 2- ). Ex. Na 2 O (s) 2 Na + (aq) + O 2- (aq) O 2- (aq) + H 2 O (l) 2 OH - (aq) ___________________________________________

3 M ETAL O XIDES Ex. BaO (s) Ba 2+ (aq) + O 2- (aq) O 2- (aq) + H 2 O (l) 2 OH - (aq) ___________________________________________ Ex. Write a balanced formula equation for the overall reactions of the following oxides with water: CaO: Li 2 O:

4 N ON -M ETAL O XIDES Non-Metal Oxides (or Acidic Anhydrides) act as ACIDS in solution. Some common examples of non-metal oxides : NO 2, N 2 O 5, SO 2, SO 3, CO 2, Cl 2 O Ex. SO 2(g) + H 2 O (l) H 2 SO 3 (aq) H 2 SO 3 (aq) + H 2 O (l) H 3 O + (aq) + HSO 3 - (aq)

5 N ON -M ETAL O XIDES Ex. 2NO 2(g) + H 2 O (l) HNO 3 (aq) + HNO 2 (aq) HNO 3 (aq) + H 2 O (l) H 3 O + (aq) + NO 3 - (aq) Metalloid Oxides usually have LOW solubility so not many ions are freed to undergo hydrolysis. So very little hydrolysis occurs and they do not act AS acids or bases. Hebden Textbook Page 185 Questions #

6 A CID R AIN Since our atmosphere naturally contains CO 2 (an acidic anhydride), some of this reacts with water (rain) to make the rain slightly acidic: CO 2(g) + 2H 2 O (l) H 3 O + (aq) + HCO 3 - (aq) So natural rainwater (unaffected by human activities) can have a pH as low as 5.6 (due to the CO 2 in air). If rain has a pH < 5.6 it is called ACID RAIN.

7 A CID R AIN The main human sources of acid rain are: 1. Burning fuels containing sulphur. (SO x ) 2. Car exhaust. (NO x )

8 A CID R AIN Read pages of your textbook. Review: Sources of Acidity in Acid Rain Natural Protection Against Acid Rain Problems Associated with Acid Rain Possible Solutions Hebden Textbook Page 188 Questions #


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