Description
Potash (potassium carbonate) reacts with acidic components in dough to produce carbon dioxide gas for leavening.
Technical
Potassium carbonate (K₂CO₃) undergoes acid-base neutralization with dough acids (like lactic acid or buttermilk), releasing CO₂ through decomposition of carbonic acid (H₂CO₃ → H₂O + CO₂). This occurs without yeast fermentation.
Culinary Significance
Created lighter baked goods before baking soda availability, particularly important in regions without reliable access to yeast or where quick breads were preferred.
Science
Primary Reaction
K₂CO₃ + 2H⁺ → 2K⁺ + H₂O + CO₂
Parameters
Temperature
25°C optimal
15°C to 50°C range
Time
20-40 minutes
5 minutes – 2 hours
Equipment
Wood ash (historical source)Stone grinding implementsEarthenware mixing bowls