Sodium Thiosulphate And Hydrochloric Acid Coursework

Sodium Thiosulphate And Hydrochloric Acid Coursework-19
cheers m8 Can you explain why the reaction is first order w.r.t.

cheers m8 Can you explain why the reaction is first order w.r.t.

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The reaction is going to be affected by how fast this decomposition takes place.

Increasing the amount of HCl won't affect this step because HCl isn't involved in it.

Regards To demonstrate the concept of reaction rate in chemistry classes.

The thiosulfate ion can decompose into the sulfite ion and a colloidal suspension of sulfur, which is opaque.

Oh and remember - frequency of collisions isn't the only factor to affect the rate of reaction, temperature is important.

Molecules can collide as many times as they want, but if they don't have the correct activation energy to react they're not going to.I have done the pratical work and found that the rection was first order with respect to the thio and both first and zero order with respect to the acid, depending on the concentration.Can anyone give me some help with the reaction mechanism as I cant come up with any ideas.uses cookies to personalize content, tailor ads and improve the user experience. By using our site, you agree to our collection of information through the use of cookies. The slow step above involving the thio only is what's holding up the reaction. If you keep increasing the speed in the fast lane, cars are going to move so you don't get traffic build-up.It’s at this point where the reaction becomes zero order with respect to HCl; you can keep increasing the concentration of HCl but since it's not involved in the r.d.s. But if it's the slow lane that's causing most of the traffic, there comes a point where the increasing the speed in the fast lane won't make a difference to the traffic because there is no traffic there. The second part of my investigation is looking at the catalytic effect on the reaction I found that Iron (II) ammonium sulphate acted as a catalyst, increasing the rate of the reaction However iron (II) sulphate had no effect on the reaction It seams to me that the ammonia is having an effect, but cant explain how/why. It is a homogeneous catalyst as the catalyst is in the same physical state as the reactants.No molecules of H are involved so it is zero order with respect to the acid.No acid is in step 1 of the above mechanism as you've shown.SO2(aq) S(s) H2O(l) 2Na Cl (aq) One of the steps, in this case the rate determining/"slow" step is: S2O32−(aq) → SO32−(aq) S(s).The concentration of acid does not affect this, this is only affected by the concentration of sodium thiosulphate (see above).

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