Paersonally i would never use bakingsoda for buffer, i think there is more in it than pure SodiumBiCarbonate.
For buffer i am using a mix of 17% SodiumCarbonate (Na2CO3), and 83% SodiumBiCarbonate (NaHCO3). That will stabilize the pH to 8.3. Only 99% pure chemicals used.
Mix 71 grams SodiumBiCarbonate and 14 grams of SodiumCarbonate, and add RO/DI water to the total of 500 grams.
1ml of this solution will raise the Kh with 0.1 dKh/100 liters.
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