DP Chemistry (first assessment 2025)
Question 19M.1A.SL.TZ2.4
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.SL.TZ2.4 |
| Level | SL | Paper | 1A | Time zone | TZ2 |
| Command term | Question number | 4 | Adapted from | N/A |
4.
[Maximum mark: 1]
19M.1A.SL.TZ2.4
What is the concentration, in mol dm−3, of 20.0 g of NaOH (Mr = 40.0) in 500.0 cm3?
A. 0.250
B. 0.500
C. 1.00
D. 4.00
[1]
Markscheme
C
Examiners report
75 % of the candidates were able to calculate the molar concentration of the NaOH solution. The question had a good discrimination index.
Syllabus sections
Structure 1. Models of the particulate nature of matter » Structure 1.4—Counting particles by mass: The mole » Structure 1.4.5—The molar concentration is determined by the amount of solute and the volume of solution. Solve problems involving the molar concentration, amount of solute and volume of solution.