Originally Posted by
SDguy
Well, that didn't work, so then I just diluted it out. Finally, I got this:
First, I'm using a standard I made with Na2CO3 anhydrous. 0.312g into 1L. According to the reef chem calculator, that comes to about 16.6dKH. I use it diluted 1:1 with DI H2O, so it should be 8.3dKH.
My current Salifert kit, using all its reagents, and a 2mL sample, gives:
(1.0 - 0.73) = 0.27 x 16 x 2 = 8.64dKH close enough for me.
OK, so 0.1N HCl was too strong
Using 0.02N HCl I get:
(1.0 - 0.7) = 0.3 x 16 x 2 = 9.6dKH
to correct for the error, I do:
0.3 x 13.83 x 2 = 8.3 dKH
OK, just to confirm, I tested my standard full strength and got
(1.0-0.41) = 0.59 x 13.83 x 2 = 16.32dKH (close enough to the 16.6dKH it should be).