MadSci Network: Chemistry |
Hi Michael,
I hope that my way to approach this problem is right. There are two
components in the height of the bubbles - first, the amount of
CO2 formed by the reaction
2 C2H5COOH + Na2CO3 ->
CO2 + 2 C2H5COONa +
H2O
and, secondly, the efficiency with which the bubbles are formed.
There is probably no doubt about the fact that this reaction proceeds
faster if the temperature is higher (A good rule says, that a chemical
reaction is twice as fast if the temperature is 10 degrees higher - means
that if you have a difference of, say, 50 degrees, it is 32 times as
fast!). Then the only possible explanation is the the second point - maybe
the bubbles burst much more readily at higher temperatures? Maybe not all
of the gas is trapped in the bubbles, because at higher temperatures
there's such an amount of gas formed that most of the bubbles burst?
I think that's the point - the efficency with which the gas is trapped
may be lower and/or the bubbles burst much faster, resulting in what you
observed.
Bye,
Andreas
Try the links in the MadSci Library for more information on Chemistry.