Currently Severus is only using water as a solvent and thus can use only water-soluble compounds.
Which of the following can’t Severus use? That is, which one of the following is insoluble in water.
1. KCl
2. NH₄NO₃
3. NH₄Br
4. BaSO₄
5. NaC₂H₃O₂
Explanation: the anwser is 1.
b i think it’s a water wheel turning in a stream
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explanation: