DP Chemistry (last assessment 2024)
Question 17N.3.sl.TZ0.b
| Date | November 2017 | Marks available | [Maximum mark: 1] | Reference code | 17N.3.sl.TZ0.b |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Estimate | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 1]
17N.3.sl.TZ0.b
Sodium chloride, NaCl, can be spread on icy roads to lower the freezing point of water.
The diagram shows the effects of temperature and percentage by mass of NaCl on the composition of a mixture of NaCl and H2O.
Estimate the percentage by mass of NaCl dissolved in a saturated sodium chloride solution at +10 ºC.
[1]
Markscheme
28 «%»
Accept any specific answer in the range 27 to 29 «%».
