Other alkaline solutions
1 mark · EasyState the ion responsible for the alkalinity of sodium hydroxide solution.
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Hydroxide ion (OH^-)
Also accept: OH^-; OH–; hydroxide ion
Common mistakes: hydrogen ion; H^+
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Marking points
B1 · 1 mark · Correctly names or gives the formula for hydroxide ion (OH^-).
Worked solution
The hydroxide ion (OH^-) is responsible for alkalinity in sodium hydroxide solution.