Hi Tom,

I did a lot of research trying to find out the correct way to make an good KH standard. I'm confident that I can make a good standard using baking soda or sodium carbonate.

But

Your suggestion to use the liquid lab certified standard was the best idea of all.
Randy over at Reef Central also suggested it to me but I just overlooked it.

I'm using the lab certified KH standard and diluting it with a few class A volumetric flask, so there isn't any question as to whether the standard right.

Bill