A trainee technician is asked to prepare solutions of calcium hydroxide and barium hydroxide for a laboratory class the following week. Just as he has finished weighing out the solid samples of CaO and BaO, the fire alarm is tested and as it is the end of the day, the technician goes home. Next morning as he is trying to dissolve the BaO sample it will not dissolve in water. Why might this be?
A) The alkali metal oxides are insoluble in water.
B) Barium oxide is light sensitive and has decomposed to insoluble products.
C) BaO is not stable in air as in the presence of carbon dioxide, barium oxide has transformed to the insoluble barium carbonate.
D) BaO rapidly reacts with oxygen in the air to form BaO2 which is insoluble in water.
Correct Answer:
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