Quote:
Originally Posted by VaughnH
So, if I mix the 10 ml with 339.4 ml of distilled or DI water I get 40 dKH water? If so, I can store that easily in a 500 ml bottle, then mix 50 ml of that with 450 ml of distilled or DI water to get 500 ml (another bottle) of 4 dKH water, and not have to store so much water. Did I calculate the 339.4 correctly?
This also lets me easily make 5.3 dKH water by mixing 66.3 ml of the 40 dKH water with 433.7 ml of distilled or DI water to get a drop checker to turn green at 40 ppm of CO2.
This is a big service to us hobby folks! And, it even standardizes our measurements of CO2 concentrations so our discussions of CO2 will make a lot more sense.
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Sure Vaughn, that will work, but you need to get 10X more accurate for 339.4 mls.
For 4 KH from 40 KH, you'd do well stick to unit of 10. So 10mls of 40 KH in 90mls DI will = 100mls of 4 KH.
For those that like math:
Dilution Equation: M1V1 = M2V2
where M1 = Molarity of initial solution, V1 = volume of initial solution to be used, M2 = Molarity of final (diluted) solution, and V2 = desired volume of final dilute solution.
Here's a how to make dilutions link so you can check whatever stock solution you want to dilute to and it's fairly simple for the average hobbyist:
Serial Dilutions Made Easy
Resource Materials: Making Simple Solutions and Dilutions
The most common problem folks do: add 10mls ref solution to 100mls of DI of the stock solution rather than 10mls of ref solution to 90mls of DI water.
Dilutions: Principles and Applications
Diluting and Concentrating
Now you may all note, it would be painfully easy to make a simple dosing calculator to run any desired volume and the output would yield the final concentration.
Perhaps some wise soul will add this into the dosing calculator here?
Using this science lab tested verified sample is ideal for consistency and it;s easy to ship and relatively cheap(about 12$ which makes 3.499 liters worth of 4 KH solution).
Note: this is really no different than the dilution factors with EI dosing, we just use the tank itself and the remainder of the water after a water change and dilute that to get the max build up possible and add the ferts after.
Regards,
Tom Barr