A COUPLE OF IMPORTANT CHANGES.
Please be aware if you are going to make a reference solution, there have been a couple of changes to the measurement and proceedure that have been reconsiled in the last few days.
First is that you will want to mix 6.00g of Baking Soda, not 4.99g in your 5 liters of distilled water.
Next is that you do not want to bake the baking soda, as this can apparently change the properties if the compound.
With those two adjustments you should be good to go. Good news is, both of those make the process even easier. I should go back in my picture thread and add in these changes...
See this thread for details on these changes (page 2):
http://www.barrreport.com/articles/2...solutions.html