Zadanie 5c
Wzorowane na: Chemistry HL Paper 3, May 2023, TZ2, pytanie 5(c). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Copper(II) ions can be removed from waste water by chelation. A possible ligand is the nitrilotriacetate anion, shown.
Identify the atoms in the ligand that form coordination bonds with a copper(II) ion when it forms a complex ion.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
the nitrogen atom AND one oxygen atom from each of the three carboxylate groups «four coordinating atoms in total» ✔
Schemat punktowania
[1]: the nitrogen atom and three oxygen atoms, one from each carboxylate group. Accept either the oxygen with the negative charge or the C=O oxygen of each group. The mark is lost if more than four atoms are identified.
Komentarz
Each donor atom supplies a lone pair, so the carbonyl oxygen is as good a donor as the oxygen carrying the charge.