Say whether each oxide is acidic, basic or amphoteric: K₂O, CaO, CO₂, Al₂O₃ and SO₂…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Say whether each oxide is acidic, basic or amphoteric: , CaO, , and . Write the equation of one of the acidic oxides with water.
Need a reminder? The key ideaShow
Metal oxides are basic, non-metal oxides are acidic, and aluminium oxide is amphoteric. Across period 3 the oxides turn from basic to acidic. The formula follows the valency: oxygen has a valency of .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Basic. and CaO, oxides of metals.
Step 2. Amphoteric. .
Step 3. Acidic. and , oxides of non-metals.
Step 4. An equation. , carbonic acid.
Answer: basic: , CaO; amphoteric: ; acidic: , .
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