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The participants of the Olympiad must be prepared to work in a chemical laboratory aware of necessar โ€” Physical Chemistry Chemistry Question

PREPARATORY PRACTICAL PROBLEM P1

The participants of the Olympiad must be prepared to work in a chemical laboratory aware of necessary rules and safety procedures. The organizers will enforce the safety rules given in the Appendix A of the IChO Regulations during the Olympiad. The Preparatory Problems are designed to be carried out only in properly equipped chemical laboratories under competent supervision. We did not include specific and detailed safety and disposal instructions as regulations are different in each country. Mentors must carefully adapt the problems accordingly. Materials marked with a dagger, โ€  will not be used at the Olympiad.

1.

You have twelve unknown aqueous solutions, each containing one, and only one, of the following compounds (all of which are used):
H2Cr2O7 CaS (NH4)2CO3 CH3COONa KBr KI
NaOH BaCl2 Ca(H2PO4)2 MgSO4 Al(NO3)3 FeCl3
You have no additional reagents, only test tubes. Identify the compound in each solution.

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