Chemistry Assignment... Help! (1 Viewer)

[r.uss]

Heya. I have this first hand investigation to do where we measure the reaction time of Bicarb Soda in Vinegar at different concentrations.

I've had a few test runs with it, and I'm finding that when I put, for example, 10ml of vinegar with 90ml of water and add half a tsp of bicarb, it takes about 4 or 5 seconds to stop bubbling. But when I put the 1/2 tsp into 100ml of vinegar, it takes about 50 seconds to stop bubbling.

I have a feeling this has something to do with limiting reagents, but I'm not quite sure whether thats what they want... For some reason I have it stuck in my mind that the reaction time should be much slower for less concentration, and there should be a quick reaction for the 100% vinegar solution.

I would really appreciate it if I could get some advice or thoughts on this...

Thanks in advance =)

 

[xiao1985]

if the expmt is conducted correctly and observations are valid, then you could argue that 1/2 tsp of bicarb will result in a smaller conc of bicarb in soln, hence resulting in a slower reaction rate.

though to ensure the properness of the expmt, you should use 10mL vinegar in 90 mL of water, just to keep the conc of vinegar constant.