Posted: 7/28/2013 12:59:21 PM EDT
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I have ammonia 2% solution and a 75 gallon tank. What volume of ammonia 2% should I add to 75 gallons of water to achieve an ammonia concentration of 5ppm?
I'm getting 71 mL of ammonia 2%. __________________________________________________________________ Cross-platform gun database/electronic bound book (v1.3.2) (and the original thread). «nolite confidere in principibus, in filiis hominum quibus non est salus» |
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ppm is by molecules. Is your 2% ammonia solution by volume, weight, molar mass, etc? Is there an expression of molarity (M) anywhere on it? 2% by weight. ETA: Here's the MSDS (PDF). Mine is the "clear" ammonia that doesn't have any surfactant, perfume, or dye. |
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Quoted: ppm is by molecules. Is your 2% ammonia solution by volume, weight, molar mass, etc? Is there an expression of molarity (M) anywhere on it? For dilute aqueous solutions,that is mg/L Since a gallon is about 4 liters you want 20 mg/gallon For 75 gallons that is 1500 mg. Your 2% is 20g/L or 20mg/mL, so 75 mL |
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[1000 g/L H2O] [3.785411 L / 1 gal] [75 gal] = 283905.825 g H2O in 75 gallon tank.
283905.825g / 200,000 (to get 5 ppm) = 1.4195 g NH4OH ETA: <-- PPM done by weight here, since 5 ppm will be 1 / 200,000. 1.4195 g NH4OH / 0.02 (by weight) = 70.975 g NH4OH solution. Since I don't know the density of your solution (or the other components that make it up), I can't give you a volume, like mL, or cups, etc. Just a weight. Just reviewed the MSDS, found a specific gravity to be 0.992. 0.992 (1 g/mL H2O) = 0.992 g/mL (NH4OH solution). [70.975g NH4OH solution] [ 1mL / 0.992 g (NH4OH solution)] = 71.54 mL NH4OH solution |
Well, I put in approximately 70 mL, and tested the ammonia level at somewhere above 4 and below 8 ppm. I have trouble with shades of green, though. It's approximately where it needs to be, anyhow. I then dumped in some nitrifying bacteria, hopefully the ammonia's not so high that it kills them all. 
__________________________________________________________________ Cross-platform gun database/electronic bound book (v1.3.2) (and the original thread). «nolite confidere in principibus, in filiis hominum quibus non est salus» |
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Well, I put in approximately 70 mL, and tested the ammonia level at somewhere above 4 and below 8 ppm. I have trouble with shades of green, though. It's approximately where it needs to be, anyhow. I then dumped in some nitrifying bacteria, hopefully the ammonia's not so high that it kills them all.
__________________________________________________________________ Cross-platform gun database/electronic bound book (v1.3.2) (and the original thread). «nolite confidere in principibus, in filiis hominum quibus non est salus» Hey, we weren't way off!
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Well...
Ammonia level was actually off the charts and my green color issues were playing tricks on me. I didn't think to do serial dilutions to get a more accurate reading, but I did do an ~80% water change that brought the ammonia down to about 4ppm. Now it's down to about 2ppm without any other changes, so I figure the supplemental bacteria I added is kicking in. ETA: I think the original ammonia concentration is suspect. __________________________________________________________________ Cross-platform gun database/electronic bound book (v1.3.2) (and the original thread). «nolite confidere in principibus, in filiis hominum quibus non est salus» |
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If this is a 75 gallon aquarium then you don't have 75 gallons in it if there is substrate, rock, plants and stuff. 2.4 fluid ounces I came up with is awfully close to the 71 mg/l y'all came up with the hard way. That is the correct answer for a true 75 gallons. Nope, totally bare tank, except for a sponge filter that takes up negligible volume. __________________________________________________________________ Cross-platform gun database/electronic bound book (v1.3.2) (and the original thread). «nolite confidere in principibus, in filiis hominum quibus non est salus» |
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https://si0.twimg.com/profile_images/2727748211/c3d0981ae770f926eedf4eda7505b006.jpeg I do math, but this hurts my head. Yeah, I just changed the title. After much contemplation I realized this was just as much of a basic chemistry problem as math. __________________________________________________________________ Cross-platform gun database/electronic bound book (v1.3.2) (and the original thread). «nolite confidere in principibus, in filiis hominum quibus non est salus» |
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Chemistry and Chemical Engineering is awesome! Doing stuff like this is so convoluted it guarantees me work, and allows me to belittle those who don't understand this stuff. It's like the legal system.
I'm a Chemical Engineer and solve little problems like that every day for $$$. Problem is too simple though. Needs more mix of metric and "olde Enrish" units (e.g. Firkins and cable lengths), to really scare off those not in the "club", and run up the bill.
yeah, in this case ppm and % are most likely mass based. Volume and molecule counting is for gasses. |
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cycle fresh water to 14 gallons a day and use Prime as the water conditioner. take should get to where u need it edit: tank not take
Sorry, bro, get in the take.
__________________________________________________________________ Cross-platform gun database/electronic bound book (v1.3.2) (and the original thread). «nolite confidere in principibus, in filiis hominum quibus non est salus» |
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Ammonia went down to 0.5 ppm. I added 5 mL of the ammonia solution, which brought it up to 2-3 ppm. Though I didn't test baseline nitrates or nitrites, the former is at 5 ppm and the latter at 1-2. I suppose I'll keep doing this for a week or two, and add supplemental ammonia as necessary.
__________________________________________________________________ Cross-platform gun database/electronic bound book (v1.3.2) (and the original thread). «nolite confidere in principibus, in filiis hominum quibus non est salus» |