A student measures the pH of a solution using two pH meters. Meter A displays a reading of 6.4 and meter B displays a reading of 6.37. Why does meter B give a measurement with lower uncertainty?
It has finer resolution, so smaller differences in pH can be recorded.
It allows an anomalous pH reading to be included when finding a mean.
It makes the range smaller whenever the pH measurement is repeated.
It rounds the pH more, so the reading is closer to the true value.
95 exam-style questions on AQA GCSE Chemistry 3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations, covering 3.1.1 Conservation of mass and balanced chemical equations, 3.1.2 Relative formula mass, 3.1.3 Mass changes when a reactant or product is a gas, and 3.1.4 Chemical measurements. Each one has a worked solution and a mark scheme showing where the marks go.