Potassium Carbonate Solution

Potassium carbonate solution is the pre-mixed aqueous form of potassium carbonate — typically supplied as a 40–50% w/v concentrated solution that remains liquid at room temperature and is convenient for volumetric measurement in liquid developer concentrate preparation.^[1] Photochemically identical to the dry salt; the pre-mixed form simply saves the dissolution step for workers making liquid developer concentrates in bulk.

Photographic uses

See the primary potassium carbonate page. The solution form is preferred in:

• Commercial liquid developer concentrates: Most pre-mixed photographic developers (HC-110, DD-X, etc.) use potassium carbonate solution rather than the dry salt for liquid-concentrate manufacturing.
• Home-mixed liquid concentrates: DIY developer formulas that specify volumetric rather than gravimetric measurement often call for potassium carbonate solution at a specified concentration.

Practical notes

Supplied as clear colorless liquid (40–50% w/v typical). Shelf-stable indefinitely in closed glass or HDPE containers. The solid form's hygroscopic nature is largely irrelevant for the solution.

For strength conversion: a 50% w/v solution is 500 g K₂CO₃ per litre; a 40% solution is 400 g/L. Substituting dry potassium carbonate in a recipe that specifies solution form, adjust by the concentration stated.

Related compounds

Potassium carbonate — the primary page covering chemistry and photographic use.