Trying out Citric acid and Baking soda CO2 - Page 37 - The Planted Tank Forum
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post #541 of 872 (permalink) Old 10-11-2015, 04:39 PM Thread Starter
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Hey, how does liquid from bottle A get pulled in bottle B?


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By the two bottles pressure forcing the liquid through the tubes as the bottles need to equalize pressure between the two.
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post #542 of 872 (permalink) Old 10-11-2015, 05:12 PM
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By the two bottles pressure forcing the liquid through the tubes as the bottles need to equalize pressure between the two.
Ah, I see from the video. It takes a bit of tooling around to get it started. So both need to be solutions. One can't be a solution, the other powder.


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post #543 of 872 (permalink) Old 10-11-2015, 05:57 PM Thread Starter
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Ah, I see from the video. It takes a bit of tooling around to get it started. So both need to be solutions. One can't be a solution, the other powder.
Correct. Although I have found on the baking soda side you can use far less water than recommended. Just need enough to cover the powder a tad.
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post #544 of 872 (permalink) Old 10-12-2015, 08:54 PM
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I did an experiment last weekend using the regular citric acid ratio and dry baking soda which worked fine until my setup started leaking.
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post #545 of 872 (permalink) Old 10-12-2015, 09:24 PM Thread Starter
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I did an experiment last weekend using the regular citric acid ratio and dry baking soda which worked fine until my setup started leaking.
True enough. The standard formula works real well. But its fun to try and make things work better
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post #546 of 872 (permalink) Old 10-13-2015, 12:49 AM
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Originally Posted by Jimklemme View Post
I did an experiment last weekend using the regular citric acid ratio and dry baking soda which worked fine until my setup started leaking.
oh, interesting. You got solution to dry soda to work. Try regular water & dry baking powder.
It'll save you money on citric acid and baking powder isn't any more expensive than baking soda.


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post #547 of 872 (permalink) Old 10-13-2015, 03:13 AM
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Originally Posted by mistergreen View Post
oh, interesting. You got solution to dry soda to work. Try regular water & dry baking powder.
It'll save you money on citric acid and baking powder isn't any more expensive than baking soda.
How will it save money? Explain more and include your formula, please
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post #548 of 872 (permalink) Old 10-13-2015, 03:35 AM
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How will it save money? Explain more and include your formula, please
Huh? I thought I did. You don't need to buy citric acid, or any acid.


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post #549 of 872 (permalink) Old 10-13-2015, 06:12 AM
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Huh? I thought I did. You don't need to buy citric acid, or any acid.
Yes reading it with a headache I misunderstood.

Have you tried this using the system?
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post #550 of 872 (permalink) Old 10-13-2015, 05:34 PM
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I can see that using baking soda would have the potential to be cheaper than buying baking and citric acid. I might try this out in my test setup.
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post #551 of 872 (permalink) Old 10-13-2015, 06:40 PM
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Originally Posted by ecotanker View Post
This CO2 methods has inspired me to looking up some chemistry lessons from high school, to figured out what is the best amount to use for each so that little of the citric acid or carbonate remains.

The formula for this reaction, according to a web search is
3NaHCO3 + C6H8O7 --> C6H5Na3O7 + 3CO2 + 3H2O

This suggest that 3 mole of baking soda ( NaHCO3 ) is needed to react with one mole of citric acid (C6H8O7) . Using an online mole to gram converter, give s that 3 mole of NaHCO3 is around 250 g and one mole of citric acid is around 192 g.
Jimklemme perhaps this formula will help you on deciding the formula for baking soda.

I would like to understand this formula. Got any links that would explain it?

Last edited by Hilde; 10-13-2015 at 06:52 PM. Reason: added
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post #552 of 872 (permalink) Old 10-13-2015, 07:04 PM
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Try regular water & dry baking powder.
Seems from an article on the difference between baking soda and baking powder that the Co2 from baking powder is less consistent since heat produces some of its Co2
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post #553 of 872 (permalink) Old 10-13-2015, 09:59 PM
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Seems from an article on the difference between baking soda and baking powder that the Co2 from baking powder is less consistent since heat produces some of its Co2
Heat produces CO2 for baking soda too.

Never mind on using water and baking powder. I just did a test and the acid in baking powder does not completely react with the soda.

I mixed BP with water, let the fizz die down. I then added vinegar into the solution and more fizz was produced (much more vigorous than plain water).

The BP you get from the store is Double acting that's why the incomplete reaction.

You'd want Single Acting BP but it's not sold through stores.


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Last edited by mistergreen; 10-13-2015 at 10:22 PM. Reason: +
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post #554 of 872 (permalink) Old 10-14-2015, 03:47 AM
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I am looking into this and wonder what is the best one to get? I do not really like the caps and hose sets so that leaves it down to plastic or aluminum? The aluminum ones look like it has an adjustable release valve and looks more durable.

One more thing, do all of you actually squeeze A to get these started?

Can't you just prime B with some citric acid then cap it and let it build in B to fill them both?

Seems if you get lets just say 10 days to make it simple.
Using 200g BS in B and 200g CA in A add and mix A as normal.
B add just the soda but add 1/10th extra (One days worth based on simple 10 day math)
Then add your water WITH 1/10 of CA into B and cap it up quick. I would think 1 days worth of CO2 should prime it and get it running. Maybe not could need more, but even adding more would not waste what you have in there to prime and extend by that much time.

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post #555 of 872 (permalink) Old 10-14-2015, 10:53 AM Thread Starter
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I do squeeze to start. Very easy and no rush to cap. Your trying to fix a problem that isn't there.
The powders are not used equally so there is not "a one days worth".
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