Dilute sulphuric acid is electrolysed between platinum electrodes…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Dilute sulphuric acid is electrolysed between platinum electrodes. A steady current of flows for minutes. Find the moles of electrons that pass, and the volumes of hydrogen and oxygen at and , in millilitres. One mole of gas takes up there.
Need a reminder? The key ideaShow
, with the time in seconds, and . For , the mass is . The same charge through different cells gives masses in the ratio of . At and one mole of gas is .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Charge. .
Step 2. Electrons. .
Step 3. Hydrogen. gives . Volume: .
Step 4. Oxygen. gives . Volume: .
Answer: of electrons, of hydrogen and of oxygen.
Check. is , as the formula of water says.
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