Interpret pH curves for all four combinations of strong and weak monoprotic acids and bases: initial pH, buffer region, half-equivalence point where pH = pKa, equivalence point pH above or below 7, and the size of the vertical jump.
Tę umiejętność sprawdza 18 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Which solutions could produce the titration curve shown? In each option the titrant is named first, then the solution in the flask. A. Strong base added to strong acid B. Strong base added to weak acid C. Weak base added to weak acid D. Strong acid added to…
The curve shows the pH during the titration of 25.0 cm3 of a weak monoprotic acid with 0.100 mol dm−3 NaOH. Which value is the pKa of the acid? A. 2.6 B. 6.0 C. 8.2 D. 3.8
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…
Sketch, on the axes provided, the pH curve for this titration.
What is the best indicator to use in the titration of propanoic acid with potassium hydroxide? A. Methyl orange, pKa = 3.7 B. Bromocresol green, pKa = 4.7 C. Bromothymol blue, pKa = 7.0 D.…
The pH curve below was obtained when sodium hydroxide solution was added to a sample of ethanoic acid until the base was in excess. Which indicator would be most suitable for this titration? A. Methyl red, pKa = 5.1 B. Phenolphthalein,…
Hexanoic acid, CH3(CH2)4COOH, is a weak acid. The graph shows how the pH changes during the titration of a 20.0 cm3 aqueous solution of hexanoic acid with aqueous sodium hydroxide. (i) Deduce an expression for the equilibrium constant, K,…
In a titration, 25.0 cm3 of 0.100 mol dm−3 ethanoic acid, CH3COOH, was placed in a flask and 0.100 mol dm−3 sodium hydroxide solution was added from a burette. The pH curve is shown. (i) Using section 18 of the…
The pH curve below is produced when 25.0 cm3 of ethanoic acid of concentration 0.100 mol dm−3 is titrated with sodium hydroxide solution of concentration 0.100 mol dm−3. Besides water and sodium ions, which species…
In a titration, 25.00 cm3 of a 0.120 mol dm−3 solution of a weak monoprotic organic acid, HA, was neutralized by adding sodium hydroxide solution, NaOH(aq), from a burette. The pH curve obtained is shown. (i) Determine the…
A 20.0 cm3 sample of a weak monoprotic acid, HA, was titrated with sodium hydroxide solution of concentration 0.100 mol dm−3. What is the pKb of the conjugate base of HA, A−? A. 3 B. 5 C. 9 D. 11
A neutralization curve for a weak acid, HA, titrated with a strong base is shown. (i) Estimate the pKa of HA. (ii) Explain, using an equation, why the pH changes very little when small volumes of strong base are added to the weak acid in the buffer…
Which graph represents the pH curve for the titration of a weak acid with a strong base? A. Graph A B. Graph B C. Graph C D. Graph D
A 20.0 cm3 sample of a weak monoprotic acid was titrated with a strong base. The graph shows the pH of the mixture as the base was added. What is the pH at the equivalence point? A. 4.7 B. 7.0 C. 8.7 D. 12.5
Which titration produces the pH curve shown? A. Strong acid added to a strong base B. Weak acid added to a strong base C. Strong base added to a weak acid D. Strong acid added to a weak base
The titration curve shown was recorded with a pH meter. Which type of titration does it represent? A. Weak acid added to a weak base B. Weak base added to a weak acid C. Strong base added to a weak acid D. Strong acid added to a weak base
A weak acid is titrated with sodium hydroxide solution. Which value of pKa can be estimated from this titration curve? A. 8.4 B. 4.2 C. 2.6 D. 12.3
A 0.50 mol dm−3 solution of ammonium chloride is prepared. (i) Calculate the pH of an ammonium chloride solution with [H3O+] = 1.68 × 10−5 mol dm−3. Use section 1 of the data booklet. (ii) Write the equation for the…
Zapisujemy na Twoim urządzeniu to, bez czego serwis nie działa, np. zalogowanie. Plików analitycznych użyjemy tylko za Twoją zgodą. Szczegóły w polityce prywatności.