How do I make Oxygen and Carbon Dioxide?

[silver 2039]

I have a Bio lab in which I need to measure fluctuations in Carbon Dioxide and Oxygen using Vernier Probes, how do I change the levels of oxygen and carbon dioxide?

This is my lab so far: I need to make procdure and data table today, and carry out expirement and record data tommrow.

Testing the Vernier Probes Lab

Planning A:

Research Question: How effective is the Vernier gas probes when it comes to accuracy and sensitivity in change in oxygen and carbon dioxide levels?

Hypothesis: I believe that the Vernier probe will respond with a good deal of accuracy and sensitivity to a change in the oxygen and carbon dioxide levels.

Materials:

-Vernier gas probes for O2 and CO2
-Computer with Vernier software
-250 mL gas sampling bottle with lid
-Rubber stopper

Procedure:

O2 gas probe

1. Test 250 mL bottle for gas
2. Record original O2 level of bottle

Independent Variable: O2 level
Dependent Variable:
Controlled Variable: time, temperature

CO2 gas probe

1.Test 250 mL bottle for gas
2.Record original CO2 level of bottle
3.Drop lit match into bottle (combustion produced CO2 as one of its products)
4.Insert probe and test for change in CO2 level and record
5.Repeat twice more

Independent Variable: CO2 level
Dependent Variable: Length of time match remains in bottle and combustion occurs
Controlled Variable: temperature

Planning B:

Data:

Analysis:

Possible Errors in Results:

Conclusion:

Sources:

http://en.wikipedia.org/wiki/Oxygen

I really have no practical ideas on how to change levels of oxygen and carbon dioxide in a closed environment, I feel that I am missing something ridiculously simple and making it excessively harder for myself but I can't figure out what.

 

[Abaddon]

burn something?

 

[silver 2039]

burn something?

Thats my idea for CO2 (see above) will a macth work?

How about for oxygen?

 

[StarWorms]

Would it be possible to get hold of oxygen and carbon dioxide canisters?

 

[Yuri2356]

I have a Bio lab in which I need to measure fluctuations in Carbon Dioxide and Oxygen using Vernier Probes, how do I change the levels of oxygen and carbon dioxide?

This is my lab so far: I need to make procdure and data table today, and carry out expirement and record data tommrow.



I really have no practical ideas on how to change levels of oxygen and carbon dioxide in a closed environment, I feel that I am missing something ridiculously simple and making it excessively harder for myself but I can't figure out what.

Does the lab demand that you raise the level of the gas being tested for, or will any change suffice? If raising or lowering doesn't matter, then you can use combustion for both gas tests, since the buring will consume O2 while releasing CO2.

After all, General formula for combustion is X + Oxygen -> X-Oxide

 

[silver 2039]

Ah it does not nesssecarily require me to raise the level. I mearly need to change the level such that I can see weather the Vernier gas probes have registered the change. Heh..burning would work for both....brilliant. Well not really but still I wouldn't have thought to use it for oxygen. Thanks.

 

[aneeshm]

Just burn come hydrocarbon, like a wax candle, or, of you're feeling adventurous, look at my thread about explosives, here.

I remember a time when a friend of mine snitched some potassium nitrate from the laboratory, and put the powder into melted sugar, and mixed it in thoroughly and let is solidify. The sugar was just enough to hold the potassium nitrate firmly in place, and not crumble. He made it into very small, long, and thin balls/sticks, so that they would do much harm if they exploded. We burnt the stuff afterwords. It burned quite nicely. It even flared on each crystal of the nitrate salt.

If you're into pyrotechnics, mix in some Strontium (Crimson Red flame) or Calcium ( Brick Red flame) or Lead (White flame) salts dissolved in concentrated hydrochloric acid - that'll colour the flame.


NOTE: I am NOT responsible for any thing which may or may not be dumb you may or may not do and which may or may not result in you getting hurt or not getting hurt .

 

[Brighteye]

Just breathe some air into the container. From 21% and 0.03% you'll have something more like 17% and 5%.

For greater certainty, shove a tube down to the bottom of the container and breathe through the tube a few times. When you've done that for a minute take the tube out and stop the container.

You might even find some interesting end-tidal values of your own body.

 

[Abaddon]

Silver, how old are you?

 

[Ayatollah So]

Electrolysis of water gives you H2 and O2 nearly pure. I recommend you leave the H2 uncollected and either make sure your room is well-ventilated or don't create very much total volume of gases.

 

[Urederra]

Would it be possible to get hold of oxygen and carbon dioxide canisters?

CO2 gas tanks could be expensive, solid CO2 is cheap and can do the work. Just put some chunks of solid CO2 in a container and let them sublimate. You should be able to see CO2 levels rising.

On second thougths, the best and cheapest way is to pour some drops of concentrated HCl over solid Na2CO3. That will generate CO2 and NaCl

As for O2, electrolisis sounds fun, as the other poster said. Just remember to use inert electrodes, maybe carbon ones rather than super-expensive platinum ones.

Or you can generate oxygen chemically. There is a simple reaction you can perform with oxygen peroxide that you can buy in a pharmacy. I just cannot remember the procedure, but you should be able to find it out in any simple inorganic chemistry book.

 

[Sidhe]

Incidently plants make both. During the day they use sunlight and water to make Sugars and oxygen as a side product and at night they make CO2 by utilising sugars in the same sort of way humans do although the mechanism is much different. There is a net gain in O2 though.

Oxygen is made in many ways, although electrolysis is a good way, which produces H2 and O from water. since they from around anode and cathode, you can seperate them off too. It's actually really simple to make an experiment, all you need is a battery/ electrical source, cathode and anode, and water and some test tubes

Co2 I forget, you can get it from mixing base metals with acids though.

Baking soda in water and vinegar can be used to make CO2 from a quick google.

 

[CIVPhilzilla]

Burn something. O2 will be consumed and CO2 will be produced.

 

[Perfection]

Add a touch of flair to your presentation and use the bible as your carbon source!

 

[Sophie 378]

Making oxygen:
Decomposition of hydrogen peroxide is easy: you can use transition metals like vanadium to catalyse it (also manganese dioxide, potassium permanganate, silver) - or lumps of potato or liver for the catalase.

2 H2O2 (aq) --> 2 H20(l) + O2 (g)

Caution, this reaction is exothermic. You only need a tiny amount of catalyst.

Making carbon dioxide:
As well as burning something, you could also do thermal decomposition of calcium carbonate (CaCO3) - can use chalk, limestone etc. Eggshells are 95% CaCO3, so sayeth Wiki.

CaCO3(s) --> CaO(s) + CO2(g)

The heating will produce hot gases - the volume will change by pV = nRT.


Or just use bottled gas - my A level labs had great big cylinders of these by the fume cupboards.

 

[Synobun]

Silver, how old are you?

He's 16...

 

[Abaddon]

16\geez,\dont you learn combustino converts the teo at year 7? (13 yeards old)

Also, you could always place some pond weed in a test tuve and let it consume the /co2 and release oxogeb

 

[Synobun]

16\geez,\dont you learn combustino converts the teo at year 7? (13 yeards old)

Also, you could always place some pond weed in a test tuve and let it consume the /co2 and release oxogeb

Whoa dude, are you drunk?

 

[Abaddon]

sadly,,...i sgould be asleep, but dannysw gont "busy2 so i may aswell type here untill slee[p.

 

[Bluemofia]

Throw in some Germinating peas in the thing, and then find a chemical that reacts with CO2 and locks it away within the new compound and then put it in there.

We did a lab on this in AP Bio, except ours violated the laws of physics and biology by having the germinating peas do the reverse of cellular respiration, and the air pressure increasing over time, rather than decreasing.