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Cool! New drop checker. Ummm, now what?
I bought a drop checker from eBay and it came with no instructions. So far no response from the seller.
Can anyone tell from this picture how I should use it? I've never had one before. From the 'net I know I should put some RO water in the checker with some of the pictured solution, but I don't know in what proportions. Also, I don't know what resulting colors correspond to what CO2 levels.
Any guidance would be greatly appreciated.
Regards,
Will
Can anyone tell from this picture how I should use it? I've never had one before. From the 'net I know I should put some RO water in the checker with some of the pictured solution, but I don't know in what proportions. Also, I don't know what resulting colors correspond to what CO2 levels.
Any guidance would be greatly appreciated.
Regards,
Will
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Planted Tank Guru
First you need 4dkh for it. Then put 4dkh in it and stick in your tank.
Planted Tank Guru
Here you go..http://liquidarthome.net/khstandard


Algae Grower
You need to get or make some 4 degree KH water (distilled + sodium bicarb) to fill the ball. Then you add a bunch of the bromthymol blue reagent that is in the bottle (or from most pH test kits). Place it about 3" below water level and give it a few hours to equilibrate. A pH of 6.6 will be green and have 30ppm.
Guest
Do not add RO water to your drop checker. Do what the preceding posters said to do. If you add RO water the color changes won't tell you anything useful about your tank. Gotta be 4 dKH. (Or at least a known KH standard with no other buffers.)
Planted Member
Who needs directions??
Awesome! Thanks everyone! Who need directions when you've got plantedtank.net.
Will
Will
Guest
Don't forget to check out the search feature. Since you're new around here, I have a feeling that a lot of the old discussion threads would be really useful to you. This place has an amazing archive of knowledge.
Planted Member
Calculations
I wanted to verify VaughnH's calculations, but surprisingly I find that they differ by a factor of 2 (his recipe for a 4dHK solution, according to my calculations, should make an 8dKH solution). To make matters worse, when I test the standard I mixed according to VaughnH's recipe (using 2 different API test kits, BTW), they both return 7dKH (much closer to my calculated number than Tom's). This is scaring the hell out of me because there is no way VaughnH can be wrong!
Please help me find the error in my calculation:
1dKH is defined as 10.71mg of carbonate ion (CO3) in 1 liter of water.
From the periodic table of elements, I calculated the mass of CO3 in 1 gram of baking soda (sodium bicarbonate, or NaHCO3) to be:
.714g CO3 (in 1g sodium bicarbonate, NaHCO3)
Using Tom's recipe, 6 grams of NaHCO3 dissolved in 1 liter of water will yield 4.28g of CO3:
(6g NaHCO3 / 1L) * (0.714g CO3 / 1g NaHCO3) = 4.28g CO3/L
Since there 1dKH = 10.71mg CO3/L, or 0.0107g CO3/L, that yields a a dKH value of:
4.28g CO3/L
 = 400dKH, not the 200dKH reported by VaughnH
0.0107g CO3/L
We differ at this point by a factor of 2!!
Continuing with Tom's recipe, he takes 10ml of his standard, which, assuming it's a 200dKH solution, contains 2mg CO3 and adds that to 500ml of water, yielding a 4dKH sample:
200dKH (200mg CO3/L or .200mg CO3/ml) yields 2mg CO3:
10ml X .200mg CO3/ml = 2mg CO3
That's in 500ml of water to yield:
(2mg CO3 / 500ml) * (1000ml / 1L) = 4mg CO3/L or 4dKH
But when using my obtained 400dKH value for the first solution, the result of the second solution is 8dKH which more closely matches the API test results of the standard I mixed!
If my calculated result had simply missed the mark and the API test kits had shown something close to 4dKH, I'd think I just messed up the math, but since the test results are showing much closer to 8dKH, I went back and checked (then rechecked) the calculations and I can't find a mistake.
I'm hoping someone can find a bug here so that the sky won't start falling because I know VaughnH can't be wrong!!
Will
Please help me find the error in my calculation:
1dKH is defined as 10.71mg of carbonate ion (CO3) in 1 liter of water.
From the periodic table of elements, I calculated the mass of CO3 in 1 gram of baking soda (sodium bicarbonate, or NaHCO3) to be:
.714g CO3 (in 1g sodium bicarbonate, NaHCO3)
Using Tom's recipe, 6 grams of NaHCO3 dissolved in 1 liter of water will yield 4.28g of CO3:
(6g NaHCO3 / 1L) * (0.714g CO3 / 1g NaHCO3) = 4.28g CO3/L
Since there 1dKH = 10.71mg CO3/L, or 0.0107g CO3/L, that yields a a dKH value of:
4.28g CO3/L
 = 400dKH, not the 200dKH reported by VaughnH
0.0107g CO3/L
We differ at this point by a factor of 2!!
Continuing with Tom's recipe, he takes 10ml of his standard, which, assuming it's a 200dKH solution, contains 2mg CO3 and adds that to 500ml of water, yielding a 4dKH sample:
200dKH (200mg CO3/L or .200mg CO3/ml) yields 2mg CO3:
10ml X .200mg CO3/ml = 2mg CO3
That's in 500ml of water to yield:
(2mg CO3 / 500ml) * (1000ml / 1L) = 4mg CO3/L or 4dKH
But when using my obtained 400dKH value for the first solution, the result of the second solution is 8dKH which more closely matches the API test results of the standard I mixed!
If my calculated result had simply missed the mark and the API test kits had shown something close to 4dKH, I'd think I just messed up the math, but since the test results are showing much closer to 8dKH, I went back and checked (then rechecked) the calculations and I can't find a mistake.
I'm hoping someone can find a bug here so that the sky won't start falling because I know VaughnH can't be wrong!!
Will
Last edited by willbldrco; 03122008 at 06:40 AM. Reason: Corrected name of referenced author
Banned
I made my carbonate solution using billionzz's instructions: https://www.plantedtank.net/forums/ge...ndardhow.html
My digital scales only measure to 1 decimal place and my final solution ended up being 4.26 dKH using my LaMotte Alkalinity test kit.
It was close enough for me and I used it.
My digital scales only measure to 1 decimal place and my final solution ended up being 4.26 dKH using my LaMotte Alkalinity test kit.
It was close enough for me and I used it.
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Planted Tank Obsessed
Also, don't just add "a bunch of brothymol blue". Only add 34 drops, enough to turn the 4dKh solution a deep, royal blue.
Algae Grower
Quote:
Originally Posted by willbldrco
View Post
Please help me find the error in my calculation:
1dKH is defined as 10.71mg of carbonate ion (CO3) in 1 liter of water.
1dKH is defined as 10.71mg of carbonate ion (CO3) in 1 liter of water.
Planted Member
Quote:
Originally Posted by Ransom
View Post
Where'd you get 10.71? I thought it was 17.8575? Maybe I'm thinking of something else?
I found this value of 1dKH on various web postings. Here are a couple:
https://www.plantedtank.net/forums/wa...tml#post227872
http://www.thekrib.com/Plants/CO2/ha...arryfrank.html
I'm going bonkers trying to find the source of mismatch between my result and VaughnH's!
Will
Last edited by willbldrco; 03122008 at 06:41 AM. Reason: Corrected name of referenced author
Guest
Posts: n/a
Quote:
Originally Posted by Mishmosh
View Post
You need to get or make some 4 degree KH water (distilled + sodium bicarb) to fill the ball. Then you add a bunch of the bromthymol blue reagent that is in the bottle (or from most pH test kits). Place it about 3" below water level and give it a few hours to equilibrate. A pH of 6.6 will be green and have 30ppm.
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