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 9 zadań wzorowanych na arkuszach IB z lat 2023–2026.
Zadania sprawdzające tę umiejętność: 9 Otwórz w wyszukiwarce z filtrami
Zadanie 32
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 32
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 33
A solution has a pH of 4.0 at 298 K. What is the hydroxide ion concentration, [OH−], in mol dm−3? A. 10 B. 10−4 C. 10−10 D. 10−18
Zadanie 31
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 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 5c
The ionic product constant of pure water, Kw, is 1.00 × 10−14 at 25 °C and 5.48 × 10−14 at 50 °C. (i) Suggest why the value of Kw for pure water becomes larger as the temperature rises. (ii) Calculate both the pH and the pOH of pure…
Zadanie 22
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 27
The ionic product constant of water, Kw, has the value 2 × 10−15 at 5 °C and 1 × 10−13 at 60 °C. One solution at 5 °C and another solution at 60 °C each have a pH of 6.50. Which statement compares the concentrations of hydrogen…