An iron nail is kept in blue copper sulphate solution.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
An iron nail is kept in blue copper sulphate solution.
- Write the equation, and say what changes you see.
- Why does nothing happen if a copper wire is put in iron sulphate solution?
- If of iron reacts, what mass of copper forms? Use and .
Need a reminder? The key ideaShow
The reactivity series, most reactive first: K, Na, Ca, Mg, Al, Zn, Fe, Pb, (H), Cu, Hg, Ag, Au. A metal displaces another from its salt solution only if it is higher in the series.
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. (a) . The nail gets a brown coat of copper, and the blue solution slowly turns pale green.
Step 2. (b) Copper is below iron, so it cannot displace iron.
Step 3. (c) of iron gives of copper: .
Answer: (c) about of copper.
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