method 2 investigate how d concentration of a hydrogen peroxide solution affects d speed at which it decompose

Question

method to investigate how the concentration of a hydrogen peroxide solution affects the speed at which it decomposes to produce oxygen gas

Answer 1

Lancenigo di Villorba (TV), Italy

HISTORICAL NOTES
In ending of XIX century, an english engineer (H.J.H. Fenton) held its chemistry's lesson in laboratory near Cambridge's College. One of its students obtained a violet liquid by random mixing. When Fenton knew how its student mixed lab's reactives, he did many experiments for inquiry natue of this coloration.
It needs only to mix several aqueous solutions, e.g. ferrous salts, tartaric acid and an important product as hydrogen peroxide.
At beginning at XX century, this phenomenon was yet known as Fenton's reaction but scientists ignored its mechanism.
Some german scientist spent its research times, they was F. Haber (Chemistry's Nobel prize, 1918), Willstatter and Weiss.
Nonetheless Fenton believed in "iron's pentoxide", Haber and colleagues stated ferrous salts interact with tartaric acid (or tartrate salts) and these complex are converted.
Well, tartrates are organic units who undergo strong chemical oxidation and they become very simple products like CO2 and oxalic acid. Violet coloration derive by intermediate form, interplaced between tartrates and oxalates.
Moreover, Weiss contribute to state that ferrous salts become ferric salts, these latters are responsible for O2 release as gas bubbling.
You can think to colorimetric determination of violet hue of ferrous-tartaric mixture when mixed with different peroxide's concentrations. I think a more simple experiment.

SIMPLEST METHOD
I purpose you to build a closed vessel (e.g. "pipette-bearer" flask) disposed of an inner column (e.g. pipette).
You put a fixed amount of ferrous salts in flask, you dissolve it with a fixed amount of water. You add an known amount of hydrogen peroxide's solution, hence you close this system.
If your dispose of a thin pipette, O2 gas bubbling rises not pipette and enhance inner pressure of flask. Since gas evolved rose not the pipette, easily inner pressure push liquid to rise in pipette.
You unsterstand that the greater initial value of hydrogen peroxide' concentration, the greater final value of inner pressure, all that as you can controling on liquid's level in pipette.

I hope this helps you.

Answer 2

I think it can be identified with the help of some drops of glycerin