what investigatory project could you recommend?

Question

we need to pass an investigatory project for our chemistry class,and i'm losing hope in finding a good one, 2 of my proposals have been rejected... can you give some ideas? i would really appreciate it, thanks!

Answer 1

A classic one in the UK is how the speed of the reaction of HCl with Mg depends on the concentration of the HCl.
Or you can make it more interesting by using sodium thiosulphate instead of the Mg, and watching how fast the solution goes cloudy.