How do I prevent mass from being lost in a vinegar and baking soda experiment?
I have a paper cup, 25 mL of vinegar, and half a teaspoon of vinegar. What I need is to figure out how to keep from losing any mass when I pour the soda into the vinegar. I know that the mass is being lost because it turns into gas and escapes. But how do I prevent this? Help please?!
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4 comments a "How do I prevent mass from being lost in a vinegar and baking soda experiment?"
It’s a bit of a juggling act, but it’s possible to do the reaction inside of a balloon. Pour the vinegar into a long balloon and then twist it so that it seals off the lower section. Then add the baking soda and tie off the end. Untwist the balloon and rotate it so that the vinegar comes into contact with the baking soda. The CO2 coming off will blow up the balloon. Neat demo. And you’ve got conservation of mass.
If I were you I’d get a plastic bag or a balloon and put the baking soda in the object first then I’d add the vinegar. The best way to add this would be to use a dropper to add the vinegar then you can control the CO2 from being lost. My only question is why are you using so much vinegar for so little soda? If this is just for an assignment observe what happens then you don’t really need this much. PS make sure record the mass of ballon!
You can also use a Ziploc bag. Place your baking soda into the bag then carefully place the cup with vinegar in it into the bag. Remove all the air you possibly can, seal it then weigh the bag with all its contents. After this, you can tip the paper cup so that the vinegar comes into contact with the baking soda.
I don’t know how sophisticated your lab. equipment is, but one way would be,(and I’m assuming you meant to say ,”a half of a teaspoon of soda”, to add the soda to a sufficient amount of water to dissolve it and cover the end of a thistle tube, the thistle tube runnning through a two hole stopper placed into the mouth of the flask. Into the other hole of the two hole stopper, insert a piece of glass tubing bent to a 90 degree angle. Now record the weight of the flask, the thistle tube, the water the vinegar,the soda, the stopper, and the piece of glass tubing. Okay, now you’ll need a second flask with another two hole stopper in it. You must place a piece of glass through one hole that extends to the bottom of the flask. What you’re going to do is allow the CO2 produced in the one fask to flow through a piece of rubber tubing to the flask filled with water. The idea is to push a volume of water out of the second filled flask equal to the volume of CO2 you generate in the first. So, you’ll need a second piece of glass tubing that just enters the top of the second flask,(this is the one that’s attached to the hose that goes to the first flask). When the CO2 enters the top of the second flask, it will push water out of the flask through the long piece of tubing that extends to the bottom of the flask. Collect the water displaced in a graduated cylinder.Okay now comes the math.
You must know the volume of CO2 the temperature of the gas,( =s the temp.of the water) the barometric pressure, and the vapor pressure of water at the temperature the gas was collected. Using the gas law equations, you can calculate the volume of dry CO2 collected at STP. Since you know that at STP, 22.4 liters of CO2 weigh 44 grams, you can calculate the weight of the CO2 displaced from the first flask. If you then reweigh the first flask , and the stopper et cetera,(it should weigh less), and add he weight of the CO2 collected, you should get the same weight. Whew! I hope you followed all that; good luck!
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