Zadanie 3a
Complete the table for Trial 1 and so determine its Ka value. Use section 1 of the data booklet.
- Tabela do uzupełnienia
pH scale and hydrogen ion concentration
Calculate pH from hydrogen ion concentration with pH = -log[H+] and back with [H+] = 10^-pH, and interpret the logarithmic scale: a change of one pH unit is a tenfold change in [H+].
Tę umiejętność sprawdza 18 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Zadania sprawdzające tę umiejętność: 18 Otwórz w wyszukiwarce z filtrami
Zadanie 4a
Calculate the pH of a 0.125 mol dm−3 solution of sodium hydroxide.
Zadanie 32
A 25.0 cm3 sample of nitric acid solution has a pH of 1.0. Distilled water is added until the total volume is 500 cm3. What is [H+] in the final solution, in mol dm−3? A. 5.0 × 10−4 B. 5.0 × 10−3 C.…
Zadanie 35
How does the acidity of a solution change when its pH decreases from 5 to 2? A. Increases 3 times B. Increases 1000 times C. Decreases 3 times D. Decreases 1000 times
Zadanie 31
What is the pH of a 0.020 mol dm−3 solution of nitric acid, HNO3(aq)? A. 1.0 B. 1.7 C. 2.0 D. 12.3
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 32
Which of these aqueous solutions has the highest pH? A. 0.10 mol dm−3 HCl B. 1.0 mol dm−3 NH3 C. 0.10 mol dm−3 KOH D. 1.0 mol dm−3 KOH
Zadanie 4a
A small volume of 0.050 mol dm−3 hydrobromic acid is placed in a beaker fitted with a pH probe. Distilled water is then run into the beaker at a constant rate and the pH is logged continuously; the temperature is held at 298 K. (i) Sketch, on…
- Materiał graficzny
Zadanie 1c
A solution has a hydrogen ion concentration [H+] = 0.0063 mol dm−3. Calculate its pH.
Zadanie 3c
Hypochlorous acid, HOCl(aq), has Ka = 2.95 × 10−8. (i) Determine the pH of an aqueous solution of hypochlorous acid of concentration 0.150 mol dm−3. (ii) State one assumption you made in the calculation in (i). (iii) State…
Zadanie 27
What is the ratio of [H+] in an aqueous solution of ammonia with pH = 10 to [H+] in pure water at 298 K? A. 10 : 7 B. 7 : 10 C. 1 : 103 D. 103 : 1
Zadanie 24
The pH of solution P is 3 and the pH of solution Q is 9. What is the ratio of their H3O+ concentrations? A. [H3O+] is 3 times higher in P than in Q. B. [H3O+] is 6 times higher in P than in Q. C. [H3O+] is 1 × 103 times…
Zadanie 1a
(i) Deduce the ionic equation, including state symbols, for the reaction of hydrogen bromide gas with water. (ii) Calculate the pH of 0.25 mol dm−3 hydrobromic acid. (iii) Explain why a solution of methanoic acid has a higher pH than…
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…
Zadanie 28
A 0.010 mol dm−3 solution of a weak acid has Ka = 1.0 × 10−6. What is its pH? A. 2 B. 4 C. 6 D. 8
Zadanie 28
A weak acid has a concentration of 0.10 mol dm−3 and Ka = 1.0 × 10−7. Which value is closest to the pH of the solution? A. 1 B. 4 C. 7 D. 8
Zadanie 25
Which 0.10 mol dm−3 aqueous solution has the lowest pH? A. CH3COOH B. HCl C. H2SO4 D. NH4Cl