4% HCl

Its hard for me to find

but how do you make 4% HCl and where to buy it.

thanks

Not sure where you are, but you can purchase it at keavyscorner.com or at wps4sale.com in the states - Another option would be to purchase clean room grade (or pharmaceutical grade) which is usually around 37% and then dilute it down to 4% - there are conversion calculators on the web, and Truthquester just put a post up yesterday or the day before, I think, on how to use a conversion software.

pam wrote: ... Another option would be to purchase clean room grade (or pharmaceutical grade) which is usually around 37% and then dilute it down to 4% - ...

What is considered 'clean room grade'?
I asked at the local pharmacy but they don't have any.
The only place I can find HCl or Muriatic Acid in my town is at Home Hardware.
It comes in a 1 litre container @ 34.5% for $6.29. Would this not work?

I got mine on Ebay - pharmacies don't carry it. Clean room grade is actually used in manuafacturing or research where they have to have the cleanest HCl available.

Yes, that would work, but you would need to dilute it.

Here's the how to dilute link:
g2cforum.org/index.php/list/cdh-chlorine-dioxide-holding-solution/27380-cdh-converting-activators-from-one-percent-to-another-ex-50-to-35

I bought mine from eBay:

www.ebay.com/itm/Hydrochloric-Acid-37-Quart-Exceeds-ACS-Grade-Cleanroom-Grade-Reagent-/110989652514?pt=LH_DefaultDomain_0&hash=item19d77fb222

Handle carefully as it is a very strong, energetic acid.

I diluted using this calculator: endmemo.com/bio/dilution.php

You would add 100ml of 37% HCL to 825ml of distilled water and get 925ml of 4% HCL which will fit in a one liter or quart bottle.

To make a smaller quantity which would fit in a 100ml or 4 fl oz (US) bottle use 1/10 of each. 10ml of 37% HCL into 82.5ml distilled water for a total of 92.5ml of 4% HCL.