Definition
Sodium bicarbonate (NaHCO₃), a mild alkaline powder used in aviation as the active electrolyte-neutralizing agent for servicing nickel-cadmium (Ni-Cd) batteries. It is also used to neutralize acid spills from lead-acid batteries when mixed with water.
Plain English
A common white powder, the same kind used in baking, that neutralizes acid. In aviation maintenance it is used to clean up battery spills and to service certain aircraft batteries safely.
Context Anchor
Seen in battery servicing, battery charging areas, and cleanup instructions for lead-acid aircraft battery spills.
Derivation
Baking soda is the common name for sodium bicarbonate. “Soda” refers to sodium compounds, and “bicarbonate” identifies the chemical that reacts with acid. That helps connect the household name to its maintenance use around battery acid.
Why Pilots Care
Neutralizing acid spills prevents rapid corrosion of airframe components, battery boxes, and electrical terminals.
Grounding Statement
When baking soda touches battery acid, it often fizzes because the acid is being neutralized.
Intuition Check
Do not think of baking soda here as a cooking ingredient. In this context, it is a maintenance chemical for acid spills, especially from lead-acid batteries, and it is not a general cleaner for every type of battery fluid.
Example Sentence 1
The mechanic mixed baking soda with water to neutralize the acid that had leaked from the lead-acid battery onto the battery box.
Example Sentence 2
After the spill was neutralized with baking soda, the area was rinsed and dried before flight.