DP Chemistry (first assessment 2025)
Question 22M.1A.HL.TZ1.27
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.1A.HL.TZ1.27 |
| Level | HL | Paper | 1A | Time zone | TZ1 |
| Command term | Identify | Question number | 27 | Adapted from | N/A |
27.
[Maximum mark: 1]
22M.1A.HL.TZ1.27
In which set are the salts arranged in order of increasing pH?
A. HCOONH4 < KBr < NH4Br < HCOOK
B. KBr < NH4Br < HCOOK < HCOONH4
C. NH4Br < HCOONH4 < KBr < HCOOK
D. HCOOK < KBr < HCOONH4 < NH4Br
[1]
Markscheme
C
Examiners report
Not very well done in identifying the set of ionic compounds that were arranged in correct order of increasing pH, with no clear misconception based on the other choices.
Syllabus sections
Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.1—Proton transfer reactions » Reactivity 3.1.12—The pH of a salt solution depends on the relative strengths of the parent acid and base. Construct equations for the hydrolysis of ions in a salt, and predict the effect of each ion on the pH of the salt solution.