An electrochemical technician investigates the mass of copper deposited on a cathode during the electrolysis of a copper(II) sulfate solution.
The technician varies the electrical current and passes it through the solution for the exact same duration in each trial. The experimental results are shown in the table below:
| Current (A) | Mass of copper deposited (g) |
|---|---|
| 0.15 | 0.53 |
| 0.30 | 1.10 |
| 0.45 | 1.59 |
| 0.60 | 2.18 |
| 0.75 | 2.68 |
By considering a line of best fit that passes through the origin (0,0)(0,0)(0,0), determine the gradient (rate of mass deposition per Ampere) in g/A\text{g/A}g/A.
Estimate the current (in A\text{A}A) needed to deposit 2.34 g2.34\text{ g}2.34 g of copper.
Calculate the mass of copper (in g\text{g}g) that would be deposited using a current of 12 A12\text{ A}12 A for the same duration. Give your answer to 2 significant figures.
34 exam-style questions on OCR GCSE Chemistry Electrolysis. Each one has a worked solution and a mark scheme showing where the marks go.