Calculating pH when mixing with distilled water
Is there an easy way of calculating ending pH without relying on trial and error?
I've seen quoted ranges for DI of 5.5-7.0 pH, but understand the value can swing wildly from the lack of buffering. Mixing DI with 7.6 pH (8 dGH, 6 dKH) tap at 1:1 results in a pH of 6.8 and 165 TDS after sitting over a week. I'm aiming for a pH of 7.2, dissolved solids around 225. I'm guessing a 3:1 ratio might work but don't have time for trial and error.
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