Baked Baking Soda - same effects? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 06-04-2006, 05:24 PM Thread Starter
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Baked Baking Soda - same effects?

In the SW hobby, people bake their baking soda @ 300 degrees for an hour before using to raise pH/KH. If I use the same baked baking soda that I prepare for my SW tank on my planted tank, will I get the same pH/KH raising effects as if I hadn't baked it at all?

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post #2 of 7 (permalink) Old 06-04-2006, 06:03 PM
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I'm sitting here trying to figure out why they would do that. And for the life of my I can't understand why. Can you provide links that would give a reason for this.

If it raises the pH in a saltwater tank after being baked then it will raise the pH in freshwater after being baked.
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post #3 of 7 (permalink) Old 06-04-2006, 06:27 PM
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Sodium bicarbonate heated to 300F for one hour will turn to sodium carbonate that's more reactive than the original baking soda.

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post #4 of 7 (permalink) Old 06-04-2006, 06:54 PM
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Ahh.... Ok. IC.
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post #5 of 7 (permalink) Old 06-04-2006, 07:14 PM Thread Starter
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In that respect, shouldn't you now have to add 2x as much? 1/2 as much carbonate molecules?

Never hurts to test it out... sounds like a fun 5g container project

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post #6 of 7 (permalink) Old 06-04-2006, 08:34 PM
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OK, offhand I can't say whether 300F is actually hot enough, but the reaction would be:

2 NaHCO3 (s) --> Na2CO3(s) + H2O(g) + CO2(g)

As to the amount, it would take half as much to raise the pH the same amount as baking soda - since the carbonate ion will accept a proton to become the bicarbonate ion. Remember that saltwater folks are trying to achieve/maintain a pH>8, so this is one way to do it.

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post #7 of 7 (permalink) Old 06-05-2006, 08:24 PM
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Hmm, an hour's worth of electricity to turn baking soda into washing soda ... I wonder why Arm & Hammer doesn't make both --- oh, wait - they do! (^_-)

Wikipedia says the reaction starts at 60C (140F).
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