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Baking Soda vs Powder

The leavener pair that recipes treat as interchangeable and chemistry does not: soda needs acid, powder is self-contained.

Baking soda 1 tsp

4.8 g

Baking powder 1 tsp

4 g

Soda needs

acid: buttermilk, yogurt, molasses, citrus

Substitution

no clean 1:1 — soda is 3–4× stronger

Freshness test

powder fizzes in hot water; soda fizzes in vinegar

Storage

6 months peak power

About Baking Soda vs Powder

Baking soda (sodium bicarbonate) releases CO₂ only when acid arrives — buttermilk, yogurt, molasses, brown sugar. Baking powder carries its own acid (double-acting: once on wet, once on heat). They are not 1:1 swappable: soda is 3–4× stronger, and swapping without adjusting the acid leaves soapy or flat bakes. Freshness: powder fizzes in hot water, soda in vinegar — test older tins.