Sodium carbonate (soda ash)
alkalinity
Na₂CO₃
Manufacturer data
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What one dose does
PARAMETER
1 g / 100 L
Alkalinity
+0.5291 dKH
To raise alkalinity by 1 dKH in 100 L: 1.9 g.
How it’s used
Alkalinity with a pH lift; the common choice for two-part dosing. Baking soda baked at about 150 to 200 °C for an hour becomes soda ash.
Cautions
• Raises pH locally; dose slowly into high flow, away from the calcium part.
pH effect: raises.
Sources
Molar mass 105.99 g/mol.
stoichiometry (IUPAC atomic weights)