The graph shows a standard curve that shows the rate of reaction for an unknown standard called (x).

The relationship is the time it takes for (x) to disappear at different concentrations {0.05 mol dm3, 0.1, 0.2}.

1. The graph line should begin at 0 seconds firstly.
2. There should be three separate lines showing the 3 different concentrations. If there is only one point per concentration e.g the one for 0.05 is 20 seconds your better off just using a simple table.
3. I think it would be quite odd to determine the rate of reaction between 3 separate samples by working out the gradient so here I would’ve expected additional values for the time