Effervescence Task

[paronomasia]

Does anyone know if you can use a stronger concetration of vinegar? like Pure acetic acid? because its still vinegar, its just strong vinegar.

Pure acetic acid is really strong; you have to use the fume hood when you use it.

Does anyone know what the chemical reaction is? HC2H3O2 + CaCO3 --> ?

Oh, sorry ha ha, wrong task! My mind's somewhere else it seems. I have a latex balloon attached to the mouth of a powerade bottle. The balloon is lying down, filled with vinegar. The bottle has baking soda in it. A string pulls the balloon up enough for the vinegar to fall into the bottle.

Haha, my bad too. I was thinking about the last task.

[Primate]

Does anyone know if you can use a stronger concetration of vinegar? like Pure acetic acid? because its still vinegar, its just strong vinegar.

Pure acetic acid is really strong; you have to use the fume hood when you use it.

Does anyone know what the chemical reaction is? HC2H3O2 + CaCO3 --> ?

I think that's it.

[fleet130]

Does anyone know if you can use a stronger concentration of vinegar? like Pure acetic acid? because its still vinegar, its just strong vinegar.

I think acetic acid is acetic acid, not vinegar (vinegar may have acetic acid in it, but it has other components as well). If it didn't come in a container marked vinegar, it's subject to being disallowed and the chance of winning an appeal almost non-existent.

[Curt]

Has anyone figured out the right ratio of the vinegar to baking soda to create the most gas to fill our balloon?

or any combinations of substances that would work better?

thank you!

[Primate]

Has anyone figured out the right ratio of the vinegar to baking soda to create the most gas to fill our balloon?

or any combinations of substances that would work better?

thank you!

I don't think you have to worry about a ratio; the more baking soda/vinegar you have, the more gas you produce.

[Paradox21]

There is an optimum ratio. In theory, you want equal number of moles of reactant, then both get used up completely. For example, if I can only fit 3 grams of baking soda (or some other reactant) into my apparatus, it does me no good to continue to add more and more vinegar. If I put in a gallon of vinegar, there will be an excess of vinegar that does not react. In this case, the limiting reactant is the baking soda. If I want to produce more gas, I will need more baking soda.

You can calculate the number of moles of both substance pretty easily. Sodium bicarbonate has a molar mass of 84.01g/mol. Finding the moles of acetic acid involves finding the percentage of your vinegar that is acetic acid (either by mass or by volume) and using this molarity/molality in conjunction with the molar mass to find the number of moles of acetic acid. Ask a chemistry teacher for help if necessary.

[paronomasia]

There's really no point in getting the balloon to inflate as much as possible, just as long as it inflates (enough to trigger the next task, which can be not very much).

If the balloon is still inflating after it has triggered the next task, would that count as a parallel?

[paronomasia]

Here are my calculations:

Vinegar = 5% acetic acid by volume
1 L of Vinegar = 1000 mL of vinegar= 50 mL of acetic acid= 50mL * 1.049 g/mL= 52.49 g of acetic acid
Molar mass of acetic acid is 60.05g/mol, so there is 0.874 moles of acetic acid per L of vinegar.
There is 1 mole of acetic acid in 1.144 L of vinegar.




You need 2 moles of acetic acid per one mol of baking soda. So the ratio should be 2.288 L vinegar/ 52.45 g baking soda.

This in turn will produce one mole of CO2 gas, which at STP would be 22.4 L.

[Paradox21]

Looks good. Except calcium carbonate is not baking soda. Try sodium bicarbonate.

[Primate]

If the balloon is still inflating after it has triggered the next task, would that count as a parallel?

Nope. Tasks can keep running, even after they've triggered the next task.

@paradox, while I suppose calculating the exact stoichiometric ratio isn't a bad idea, I just meant that if you pack in a reasonable amount of vinegar and baking soda, you'll easily produce enough gas.