KH Keeper regent DIY help

[IPT]

I know I read the formula somewhere, but can't find it now.

I have 0.10M Hydrochloric Acid.

Apparently the stock KH regent is 0.2N and mixed at a 9:1 ratio (9 unit RO/DI : 1 unit concentrate).

Struggling with the math here. If I want 1L of total solution (so 9 units of RO/DI water to 1 unit of concentrate) using the 0.1M, how much of the 0.1M do I need to equal "one unit" (of the 0.2M)?

I guess it would be best to make the 0.1M into 0.2M, then add to RO/DI. Though, that may not be possible. Maybe I just need to end up with a slightly lower overall volume to get the same concentration?

Am I way off here with one being "M" and one being "N"? I just noticed that. Hopefully I didn't get the wrong stuff. Geeze, and some people say it's .02N not .2N.....I have no idea. Maybe one is how it starts and one is after the dilution?

 

[IPT]

I found this, but I am unsure. I guess I can experiment, but maybe someone knows.

"Hmm, interesting. That is the exact (diluted) normalization as the Alkatronic. They start with 0.1N and dilute it 4:1 to end up with 0.02N as well".

 

[IPT]

Looks like Google AI agrees....it states:

To go from 0.1M HCL to 0.02M HCL you add 1 part 0.1M to 4 parts Ro for 5 total parts.

So, if I use 20ml of my 0.1M and add that 80ml of RO water that should make 100ml's of a 0.02M HCL solution. I believe that is the end point concentration achieved by using whatever their stock concentrated solution is in a 1:9 ratio with RO water. looks like I can just dilute my 0.1 and get to the end point using less RO water. Seems to make sense since I (maybe) starting with a more dilute HCL solution so less RO water would be needed to get to the end point.

Now I just need to confirm the end point is 0.02M of HCL, or make some and test it :).

 

[Randy Holmes-Farley]

Yes.

1 M HCl = 1 N acid. Thst is not true of all acids, however.

0.2 N acid diluted 9:1 gives 0.02 N.

If you add 1 part of the 0.1 M into 4 parts of ro/di, the final concentration is 0.02 N.

 

[IPT]

Thanks. Mixed it up and it worked like Reef Factory solution just had to mix it at the new ratio 1:4.

Thanks

 

[Randy Holmes-Farley]

You’re welcome.

Happy Reefing!