A little question

[eldiablov]

I have a science project for the week and it involves analysing the reaction times of chemicals when changing the concentration of a certain chemical.

My teacher said there was a way to incorporate physics into this experiment, my objective is to figure out how to increase reaction speed. However, I dont want to do something simple like use a catalyst or heat up the beaker.

By the way this idea has to feasible because my school is supplying the equipment.

[Ciaran_]

Are you reacting two fluids or a fluid and a solid?

[eldiablov]

two fluids

Sodium Thyosulphide(or something like that) and hydrochloric acid and water (to slow down the reaction). The water HAS to remain there by the way.

[Ciaran_]

If you can't change the concentration, temperature or use a catalyst increasing the pressure is the only other way I can think of changing reaction speed.

[eldiablov]

I doubt pressure would be possible to change without complex equipment ?

And btw what would have been the difference if I used one solid. Because that may be something I could change.

[Ciaran_]

If you are using a solid the finer you grind it the faster it will react. So pebble size material wouldn't react as fast as the material ground into a powder.

[Sir_Axxewraith]

I've just done this.

Is it the one where you have to wait and see how long it takes for the X on the paper to dissapear ?

And it's Thiosulphate.

Wait.. How old are you? I've done this and i'm 14.

[eldiablov]

I'm doing this for coursework, i'm in higher tier and i'm doing this in year 11.