Displacement reactions

[Runner]

Can anyone please tell me how fast these reactions will occur. Haven't done the experiments yet, so I'm mystified

 

Zn(s) + CuSO4(aq) ==> ZnSO4(aq) + Cu(s)

 

Zn(s) + Pb(NO3)2 (aq) ==> Zn(NO3)2 + Pb(s)

 

Any help would be much appreciated. Thank you.

[YT2095]

how "FAST"?

 

it`ll start instantly, but the speed depends on many factors.

concentration of sollution, temperature, surface area of your Zn etc...

it`s rather diffucult to impossible to calculate in all honesty

but it certainly wont Explode

[Runner]

Thank you for the reply.

 

The reason why I’m asking this is because I have to plan an experiment to suggest that the enthalpy change between a metal and a solution of a salt is related to the relative position of two metals in the reactivity series. Firstly I thought that if the reaction takes too long I should use a temperature –time graph and use a temperature correction method to obtain an accurate result. If the reaction is slower than a neutralisation reaction I could simply just note the maximum temp it reaches. Which one is most sensible If I was going to use about 3.30g of zinc with the solutions being approximately 50cm^3 ? Thank you.