Ammonia, NH3 / The test for ammonia gas
1 mark · EasyState the melting (freezing) point of pure water at 1 atmosphere pressure.
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0°C
Also accept: 0°C; zero degrees Celsius; 0 degrees Celsius
Common mistakes: 100°C; Saying room temperature
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Marking points
B1 · 1 mark · States 0°C (zero degrees Celsius).
Worked solution
Pure water freezes (or melts) at 0°C at 1 atmosphere.