Question 19N.3.sl.TZ0.a
| Date | November 2019 | Marks available | [Maximum mark: 1] | Reference code | 19N.3.sl.TZ0.a |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Draw | Question number | a | Adapted from | N/A |
A student investigated how the type of acid in acid deposition affects limestone, a building material mainly composed of calcium carbonate.
The student monitored the mass of six similarly sized pieces of limestone. Three were placed in beakers containing 200.0 cm3 of 0.100 mol dm−3 nitric acid, HNO3 (aq), and the other three in 200.0 cm3 of 0.100 mol dm−3 sulfuric acid, H2SO4 (aq).
The limestone was removed from the acid, washed, dried with a paper towel and weighed every day at the same time and then replaced in the beakers.
The student plotted the mass of one of the pieces of limestone placed in nitric acid against time.
[Source: © International Baccalaureate Organization 2019]
Draw a best-fit line on the graph.
[1]
best-fit smooth curve ✔
NOTE: Do not accept a series of connected lines that pass through all points OR any straight line representation.