Zadanie 4a
Calculate the pH of a 0.125 mol dm−3 solution of sodium hydroxide.
Ionic product of water, Kw
Use Kw = [H+][OH-] = 1.0 × 10⁻¹⁴ at 298 K to calculate [OH-] from [H+] or vice versa, classify solutions as acidic, neutral or basic from the relative concentrations, and explain how Kw and the pH of pure water change with temperature.
Tę umiejętność sprawdza 12 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Zadania sprawdzające tę umiejętność: 12 Otwórz w wyszukiwarce z filtrami
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…
Zadanie 25
Which solution has a pH of 11.0 at 298 K? A. 10−3 mol dm−3 KOH(aq) B. 10−11 mol dm−3 KOH(aq) C. 10−3 mol dm−3 NH3(aq) D. 10−3 mol dm−3 HCl(aq)
Zadanie 25
Which of these solutions has a pH greater than 7 at 25 °C? A. [H+] = 1.0 × 10−5 mol dm−3 B. [OH−] = 1.0 × 10−10 mol dm−3 C. [H3O+] = 1.0 × 10−11 mol dm−3 D.…
Zadanie 24
An aqueous solution at 298 K has a pH of 9.20. Kw = [H+][OH−] = 1.00 × 10−14 at 298 K What is the hydroxide ion concentration of the solution, in mol dm−3? A. 6.31 × 10−10 B. 1.58 × 10−9 C.…
Zadanie 5c
Nitric acid is a strong acid manufactured on a large scale. A pH probe is immersed in a small volume of 0.010 mol dm−3 nitric acid. The pH is recorded while distilled water is added to the acid at a steady rate and at constant temperature. (i)…
- Materiał graficzny
Zadanie 3b
Potassium oxide, 0.0150 mol, was dissolved in water and the solution was made up to a final volume of 250.0 cm3. (i) Write a balanced equation for the reaction of potassium oxide with water. (ii) Calculate the pH of the solution.
Zadanie 18
Ammonia dissolves in water as shown in the equation below. What will happen if the temperature of the solution is increased? NH3(g) + H2O(l) ⇌ NH4+(aq) + OH−(aq) ΔH⊖ = −31 kJ mol−1 A. The equilibrium shifts to the left…
Zadanie 5a
Calculate the pH of the potassium hydroxide solution.
Zadanie 20
What is the hydroxide ion concentration, in mol dm−3, of a solution with pH = 9.0 at 298 K? A. 1.0 × 10−9 B. 1.0 × 10−5 C. 1.0 × 105 D. 1.0 × 10−14
Zadanie 2e
Methylamine is a gas that dissolves in water to form an alkaline solution: CH3NH2(aq) + H2O(l) ⇌ CH3NH3+(aq) + OH−(aq) (i) State the relationship between CH3NH3+ and CH3NH2 in terms of the Brønsted-Lowry theory. (ii) A sample of…
Zadanie 19
Which 0.0050 mol dm−3 solution is most likely to have a pH of 12.0 at 298 K, where Kw = 1.00 × 10−14? A. Ba(OH)2(aq) B. NaOH(aq) C. NH3(aq) D. H2SO4(aq)