A chemical synthesis of the classic “Salt & Vinegar” flavor profile found in snack foods.

Yield: ~80 g (½ cup) | Prep: 15 min | Active Cook: 45 min | Passive Cure: 4 hr+

Headnote

Real “Salt & Vinegar” flavor is not made by drying vinegar; it is made by chemically neutralizing an acid (vinegar) with a base (baking soda) to create a new salt called Sodium Acetate. Teaching Idea: Stoichiometry. We intentionally use an excess of vinegar in this ratio. If we used too much baking soda, the unreacted soda would remain in the final product, resulting in a soapy, metallic, and bitter taste. Excess vinegar simply evaporates, ensuring a clean, sharp flavor.

Ingredients

The Reactants

1000 g (1 liter) distilled white vinegar (5% acidity)
55 g (3 ½ tbsp) baking soda (sodium bicarbonate)

The Buffer Blend (Post-Process)

10 g (2 tsp) citric acid
10 g (1 tbsp) Diamond Crystal Kosher Salt
5 g (2 tsp) cornstarch

Mise en Place (Action Checklist)

Ventilate the kitchen: Turn on the hood fan (boiling vinegar creates pungent fumes).
Select the vessel: Use a large, non-reactive stockpot (at least 4 liters). The reaction will foam aggressively.
Prepare the drying zone: Line a rimmed baking sheet with parchment paper.

Method

Phase 1: The Neutralization.

Pour the distilled white vinegar into the stockpot. Place over medium heat. Slowly sprinkle in the baking soda a little at a time, whisking constantly. Safety Cue: Wait for the foaming to subside before adding more. Adding it all at once will cause a volcanic overflow.

Phase 2: The Reduction.

Once all the baking soda is dissolved and fizzing stops, increase heat to high and bring to a boil. Reduce the liquid by 90% (until only about 100 ml remains).

Sensory Cue: As the water evaporates, the bubbles will become smaller, thicker, and slower.

The “Ice Skin” Test: Blow gently on the surface of the liquid. If a thin, opaque skin forms instantly (like ice on a puddle), the solution is supersaturated and ready. Remove from heat immediately.

Phase 3: The Crystallization.

Pour the hot syrup onto the parchment-lined baking sheet. Do not place it in the oven yet. Let it sit at room temperature for 2–4 hours.

Why: Sodium Acetate Trihydrate melts at 136°F/58°C. If you put the wet syrup into a hot oven, it will remain liquid. It must crystallize into a solid “ice” block at room temperature first.

Phase 4: Dehydration.

Once the liquid has turned into a solid, white crystalline mass, break it into shards. Set your oven to its lowest possible setting (150°F–170°F/65°C–75°C). Place the shards in the oven and dry for 1 hour or until chalky and completely brittle.

Phase 5: Pulverization.

Transfer the dried shards to a spice grinder or mortar and pestle. Add the citric acid, Diamond Crystal salt, and cornstarch. Grind into a fine, snow-white powder. Store in an airtight container immediately.

Chef’s Notes

The “Buffer” Blend: Pure Sodium Acetate has a vinegar aroma but lacks the sharp “bite” on the tongue. The addition of Citric Acid provides that aggressive tang associated with potato chips, while the cornstarch prevents the highly hygroscopic powder from turning into a sticky brick in the jar.

Glossary

Sodium Acetate: The sodium salt of acetic acid. It is used as a flavor additive and shelf-life extender.
Exothermic: A chemical reaction that releases heat.
Hygroscopic: The tendency of a substance to absorb moisture from the air. This powder will clump quickly if left uncovered.