17.22—Record observations and write suitable equations for the reactions of Cr3+(aq), Mn2+(aq), Fe2+(aq), Fe3+(aq), Co2+(aq)

Be able to record observations and write suitable equations for the reactions of Cr3+(aq), Mn2+(aq), Fe2+(aq), Fe3+(aq), Co2+(aq), Ni2+(aq), Cu2+(aq) and Zn2+(aq) with aqueous sodium hydroxide and aqueous ammonia, including in excess.

Use —record observations and write suitable equations for the reactions of cr3+(aq), mn2+(aq), fe2+(aq), fe3+(aq), co2+(aq) to connect the rule to the data and decision in the question.

This matters because —record observations and write suitable equations for the reactions of cr3+(aq), mn2+(aq), fe2+(aq), fe3+(aq), co2+(aq) determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —record observations and write suitable equations for the reactions of cr3+(aq), mn2+(aq), fe2+(aq), fe3+(aq), co2+(aq) to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: use the formula and units given in the question, show the substitution and interpret the result; the calculation alone is not the conclusion.