Zadanie 1d
Nitric acid, HNO3, is strong, while nitrous acid, HNO2, is weak. (i) Outline the difference between a strong and a weak acid. (ii) Deduce the Lewis formula and the molecular geometry for the nitrite ion, NO2−.
Proton transfer reactions
Umiejętności w tym dziale
Umiejętności z tego działu sprawdza 86 zadań wzorowanych na arkuszach IB z lat 2022–2026. Dział pojawia się w 45 z 54 arkuszy w bazie.
Zadania z tego działu: 86 Otwórz w wyszukiwarce z filtrami
Zadanie 1a
Hydrochloric acid, HCl(aq), and hydroiodic acid, HI(aq), ionize completely in water, whereas propanoic acid, CH3CH2COOH(aq), ionizes only partly. 25.0 cm3 of 0.200 mol dm−3 HCl(aq) was titrated with sodium…
Zadanie 1a
(i) Write a balanced equation for the reaction, including state symbols. (ii) Deduce what property of this reaction makes it possible to follow its rate by both methods. (iii) Magnesium carbonate was used in excess so that all of the acid would react.…
- Materiał graficzny
Zadanie 2c
(c) After 30 minutes, the student stopped heating the mixture and titrated a sample of the solution remaining in the flask with NaOH to determine the experimental yield of propanoic acid. Explain why the titrated sample will give an incorrect value for the…
- Materiał graficzny
Zadanie 4a
Calculate the pH of a 0.125 mol dm−3 solution of sodium hydroxide.
Zadanie 4b
A sample of the sodium hydroxide solution is gradually added to 25.0 cm3 of an aqueous solution of an unknown organic acid, producing the following pH curve. Calculate the concentration of the unknown organic acid.
- Materiał graficzny
Zadanie 24
Which products are formed when sulfuric acid, H2SO4(aq), reacts with solid magnesium carbonate, MgCO3(s)? A. MgSO4(s) and H2CO3(aq) B. MgSO4(aq), H2O(l) and CO2(g) C. MgSO4(s), H2O(l) and…
Zadanie 24
Two acid-base equilibria are shown. Equation 1: HCN(aq) + H2O(l) ⇌ CN−(aq) + H3O+(aq) Equation 2: NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH−(aq) Which option correctly describes the role of water in each forward reaction? A. In equation 1 water…
Zadanie 25
Sulfuric acid reacts with solid copper(II) oxide. Which salt is formed? A. CuSO3 B. CuSO4 C. Cu2SO4 D. H2O
Zadanie 25
The pH of a dilute aqueous solution at 25 °C increases from 4.0 to 6.0. How do the concentrations of hydrogen ions and hydroxide ions change? A. [H+] decreases 100 times and [OH−] increases 100 times B. [H+] decreases 10 times and…