Reacting acids with bases
2 marks · EasyExplain which types of metal oxides form soluble alkalis when added to water. Give one example in your answer.
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Also accept: All Group 1 metal oxides are soluble in water and form alkalis; for example, sodium oxide forms sodium hydroxide
Common mistakes: Naming a Group 2 oxide; Saying all metal oxides are soluble
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Marking points
B1 · 1 mark · States that Group 1 metal oxides form soluble alkalis in water.
B1 · 1 mark · Gives a suitable example: sodium oxide or potassium oxide.
Worked solution
Group 1 metal oxides, such as sodium oxide, dissolve in water to form alkalis (sodium hydroxide).
For example: Na2O(s) + H2O(l) → 2NaOH(aq)