Response to Help- need chemist on crystal vs anhydrous K2CO3

Ah-ha! I just found the correct formula for Potassium Carbonate in crystal form. It's 2X on the potassium and 3X on the water, so Anchell's "1.5 molecules of water" is correct. That means my first experiment was pretty fouled up, as I had about twice the amount of carbonate as desired. Now my only question is about the buffer referred to. Is this something that should be added?

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