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…
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 sprawdzają 22 zadania wzorowane na arkuszach IB z lat 2022–2026.
Zadania sprawdzające tę umiejętność: 22 Otwórz w wyszukiwarce z filtrami
Zadanie 4a
Calculate the pH of a 0.125 mol dm−3 solution of sodium hydroxide.
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 28
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 1b
In aqueous solution hydrogen cyanide behaves as a weak acid. (i) Write an equation for the ionization of hydrogen cyanide in water. (ii) Outline two ways in which a solution of 0.050 mol dm−3 HCN could be distinguished experimentally from…
Zadanie 24
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 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 26
The pH of a solution is measured as 4.0. Which value, in mol dm−3, is the hydrogen-ion concentration, [H+], of this solution? A. 4.0 × 10−4 B. 1.0 × 10−4 C. 1.0 × 104 D. 4.0 × 104
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 25
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 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 1c
A solution has a hydrogen ion concentration [H+] = 0.0063 mol dm−3. Calculate its pH.
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 20
A 10.0 cm3 sample of 0.0100 mol dm−3 nitric acid, HNO3(aq), is diluted with water to a final volume of 10.0 dm3. What is the change in pH? A. increases by 3 B. increases by 2 C. decreases by 2 D. decreases by 3
Zadanie 21
What is the pH of a 5.0 × 10−3 mol dm−3 aqueous solution of nitric acid, HNO3? A. 0.0050 B. 2.30 C. 3.00 D. 11.70
Zadanie 19
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 1b
Calculate the pH of 0.25 mol dm−3 hydrobromic acid.
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 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)
Zadanie 20
Which 0.10 mol dm−3 aqueous solution has the lowest pH? A. CH3COOH B. HCl C. H2SO4 D. NH4Cl
Zadanie 1d
A 0.50 mol dm−3 solution of ammonium chloride has [H3O+] = 1.68 × 10−5 mol dm−3. Calculate the pH of the solution. Use section 1 of the data booklet.