First, there is a double displacement reaction in which acetic acid in the vinegar reacts with sodium bicarbonate to form sodium acetate and carbonic acid:. Carbonic acid is unstable and undergoes a decomposition reaction to produce the carbon dioxide gas :. The carbon dioxide escapes the solution as bubbles. The bubbles are heavier than air, so the carbon dioxide collects at the surface of the container or overflows it.
In a baking soda volcano, detergent usually is added to collect the gas and form bubbles that flow somewhat like lava down the side of the 'volcano. If the water is boiled off of this solution, a supersaturated solution of sodium acetate forms. This " hot ice " will spontaneously crystallize, releasing heat and forming a solid that resembles water ice.
The carbon dioxide released by the baking soda and vinegar reaction has other uses besides making a chemical volcano. It can be collected and used as a simple chemical fire extinguisher. Because carbon dioxide is heavier than air, it displaces it.
This starves a fire of the oxygen needed for combustion. Actively scan device characteristics for identification. Use precise geolocation data. Select personalised content. This experiment clearly distinguishes a chemical change from physical change. See the topics Chemical reactions and Physical change or chemical change? Vinegar - A dilute solution of acetic acid in water. A beaker or jar. The chemical reaction When baking soda is mixed with vinegar, something new is formed.
I totally forgot to include that! Thank you for the reminder - adding it to the post now. I added liquid watercolors and mixed well. I allowed it to completely dry before we did the experiment because we were away on vacation , but it will also work when it is damp. Hope that helps! That would work! And if you use chalk made from calcium carbonate, it would boost the reaction a bit since it also reacts with vinegar. Thanks for this great experiment!
Worked like a charm, cannot wait to show it to my daughters. One question: how do you colour your baking soda?
We tried food colouring we have here in France, but it did not work properly. Any advice? Thanks for all the great ideas you share! And yikes I totally forgot to include that in the post! Thank you for the reminder - adding it now. The water should help disperse the coloring.
I forgot to tell you that I followed your advice: wonderful result, the girls were excited, and the colours were great. Thanks again! Good luck for your book. Any chance to get a signed version? Thank you so much and hmmm, let me look into that!
This is a great way to talk about the algebraic property of Associativity. Use B, S and V for baking soda, soap and vinegar. Your little one will totally be able to get the idea with just those two expressions. When you ask her to repeat the words, "This means it is NOT associative," you'll be embedding some important math vocabulary as well as promoting a positive math attitude! Thanks so much for sharing this!
What a fantastic discovery project! Our next volcano will have a soapy vinegar added to it. Thanks so much. Thanks for sharing the tip. Gotta love this type of scientific experiment. Too cool! Wow, my son is going to love this experiment. Hi Lisa! It was always just normal vinegar — the part that was different was the amount that was added to each cup. Another thought … has anyone determined the volumes of ingredients that work best in various bottle sizes?
For instance, my Library class will be using 20oz bottles. Some use Some use liter. If the bottle is filled too full, insufficient amounts of CO2 will form, reducing the height of the rocket.
Not enough mixture volume and no lift off. I love the trial and error nature of this. Might be difficult to measure. And, experimenting with different size bottles is a great idea! Let us know how it goes if you try it out! Hi Chantol! Great question — for this one, they just watched the reactions to see how high the fizz went in the glass.
Thanks so much for posting your experiment! They learn a lot from watching how YOU go about asking and answering questions.
Hi there! Your informational website was very helpful! Thank you for sharing your experiment test results! The students are going to be so excited!!!
I arrived at a different ratio for actually making CO2. I used a 12 oz jar and measured how much CO2 was in the jar by lowering a lit match in it and watching the level it went out at. I extracted gas from the jar with an animal feeding syringe I got from Tractor Supply and counted how many extractions it took to empty the jar based on match tests.
I started with 3 to 1 which filled the jar and took 10 extractions to empty it. Then I tried the 12 to 1 which only half filled the jar and at 5 extractions it was empty. Then I tried 6 to 1 and again was able to get 10 extractions. I am studying in class 7.
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