The properties of oxides
3 marks · EasyThe table shows solutions formed by dissolving some oxides in water:
| Oxide | Solution pH |
|---|---|
| Aluminium oxide | 7 |
| Sulfur dioxide | 3 |
| Potassium oxide | 13 |
Which oxide forms a neutral solution? Give its pH.
State whether sulfur dioxide is a metal oxide or a non-metal oxide.
Explain why potassium oxide gives a pH of 13.
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(a) Aluminium oxide, pH 7
(b) non-metal oxide
(c) Because potassium oxide is a basic oxide that forms an alkaline solution
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Marking points
B1 (a) · 1 mark · Aluminium oxide, pH 7.
B1 (b) · 1 mark · Sulfur dioxide is a non-metal oxide.
B1 (c) · 1 mark · States potassium oxide is basic/alkaline and gives reason for high pH.
Worked solution
a) Aluminium oxide forms a neutral solution (pH 7).
b) Sulfur dioxide is a non-metal oxide.
c) Potassium oxide gives pH 13 because it is a basic oxide and forms an alkaline solution.