Zadanie 25
Wzorowane na: Chemistry HL Paper 1, May 2024, TZ1, pytanie 25. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Which method can be used to distinguish between nitric acid, HNO3(aq), and ethanoic acid, CH3COOH(aq), of equal concentration?
A. measuring the volume of sodium hydroxide solution of known concentration needed to neutralize 20.0 cm3 of each acid
B. measuring the total volume of hydrogen produced when 20.0 cm3 of each acid reacts with excess magnesium
C. measuring the mass of carbon dioxide released when 20.0 cm3 of each acid reacts with excess sodium carbonate
D. measuring the pH of each solution with a calibrated pH meter
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
D ✔
«the strong acid is fully ionized and the weak acid only partially, so the same concentration gives a lower pH for nitric acid; the other three methods depend only on the amount of acid available, which is the same for both monoprotic acids, so they give identical results»
Schemat punktowania
One mark for the correct option.