using dry ice 4 co2

[DOUGAL25]

CH4 + 2O2 → CO2 + 2H2O

3. the candle burning may not produce pure CO2. The combustion reaction may produce other gasses produced like Nitrogen (which probably isn't so bad, but still might be an influencing factor on something)

Good info here - taking a break from studying for my 1st organic chemistry exam tomorrow

Just curious, were did you get the chemical makeup of wax to be methane (CH4)? I know wax is a hydrocarbon, and that there isn't one set chemical formula for all candle wax, but I guess it doesn't make a big difference.

This does make absolute sense though, hydrocarbons + O2 -> CO2 + H2O + light + heat

According to the equation - where are these other gases, such as N, coming from? And yes, N isn't bad, as it composes roughly 78% of the air we breathe (just sucks to have it produced, cuz it drops down the overall percentage of CO2 being produced).

It's just neat to see this seemingly-useless information (Ochem) starting to make an appearance in grow room techniques. I don't doubt you though and I am going to try this instead of using yeast for CO2. Just have to watch the added heat, like you mentioned.
:stoned:

DOUGAL25 Reviewed by DOUGAL25 on 09-24-2009. using dry ice 4 co2 ive got 2 shop lights with 2 builbs in each light, 60 watts each builb, and 4 plants inthe center of the lights. i keep the lights about 2 inches from the top of the plant. the lights are hanging from the clothes rack in my closet. i bought a little fan and some plastic drop clothes (the ones for panting). covered the whole thing with the drop clothes so its hanging from the clothes rack to the floor, got 3 pounds of dry ice put it in a tub with warm water and stuck it in the enclosed area on Rating: 5

[oddish]

Just curious, were did you get the chemical makeup of wax to be methane (CH4)? I know wax is a hydrocarbon, and that there isn't one set chemical formula for all candle wax, but I guess it doesn't make a big difference.

This does make absolute sense though, hydrocarbons + O2 -> CO2 + H2O + light + heat

According to the equation - where are these other gases, such as N, coming from? And yes, N isn't bad, as it composes roughly 78% of the air we breathe (just sucks to have it produced, cuz it drops down the overall percentage of CO2 being produced).

Yeah, I don't actually know the exact formula for wax. I just know that is a lipid composed of many hydrocarbons, just like you said . So it should produce CO2 when burned.

I also found this formula on wiki...

its says, "When air is the source of the oxygen, nitrogen is by far the largest part of the resultant flue gas."

CH4 + 2O2 + 7.52N2 → CO2 + 2H2O + 7.52N2 + heat

I havn't taken chem in a while, so my knowledge is a little limited. I'm having trouble figuring how having high amounts of nitrogen will affect the amount of CO2 produced. The nitrogen doesn't seem to affect the production CO2, it's just the largest product. Do you know for sure if having lots of Nitrogen will affect CO2 yield in combustion reactions?

Also, i was doing a little more digging and found that when oxidizing hydrocarbons, lots of CO is produced, some CO2, and little NO is produced. I know that CO is toxic to humans (affects hemoglobins affinity for O2), but I dont' know its effects on plants...

I guess i shall do some experiments with other plants before I try with the real thing ...

[DOUGAL25]

I also found this formula on wiki...

its says, "When air is the source of the oxygen, nitrogen is by far the largest part of the resultant flue gas."

CH4 + 2O2 + 7.52N2 → CO2 + 2H2O + 7.52N2 + heat

I looked it up too on wiki - makes more sense now.

I havn't taken chem in a while, so my knowledge is a little limited. I'm having trouble figuring how having high amounts of nitrogen will affect the amount of CO2 produced. The nitrogen doesn't seem to affect the production CO2, it's just the largest product. Do you know for sure if having lots of Nitrogen will affect CO2 yield in combustion reactions?

I didn't mean it like that, that N would affect the quantitative amount (partial pressure) of CO2 produced. It's just a shame that the "flue gas" has to have so much N in it, and drops the percentage of CO2 in the flue gas. The amount of CO2 is unchanged. But this a cheap method of providing CO2 to the plants, not like a CO2 tank.

Also, i was doing a little more digging and found that when oxidizing hydrocarbons, lots of CO is produced, some CO2, and little NO is produced. I know that CO is toxic to humans (affects hemoglobins affinity for O2), but I dont' know its effects on plants...

Dead on about about the biochemistry with hemoglobin and CO. CO's affinity to bond to the heme is (i think) 4x stronger than O2's. It takes a while for the CO to break off the heme, and allow it to carry O2 again. Also curious for what that means to a plants biochemistry, if CO is present.

I know Stinky is great with chemistry - if she sees this, maybe she can enlighten us on the topic of CO + plants?

:stoned: