Zadanie 5b
Wzorowane na: Chemistry HL Paper 2, November 2024, pytanie 5(b). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Outline how 0.100 mol dm−3 solutions of ethanoic acid and nitric acid could be told apart.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
Alternative 1:
Method: measure the pH of both solutions ✔
Observation: ethanoic acid has the higher pH ✔
Alternative 2:
Method: react both solutions with a metal / metal oxide / hydroxide / carbonate / hydrogencarbonate ✔
Observation: ethanoic acid reacts more gently «slower effervescence or less heat released» ✔
Alternative 3:
Method: measure the electrical conductivity of both solutions ✔
Observation: ethanoic acid has the lower conductivity ✔
Schemat punktowania
M1: method; M2: matching observation. Accept other suitable methods with the corresponding observation, for example a pH titration curve, universal indicator, or the amount of heat released on neutralization. The observation must be consistent with the method chosen.