Meaning and mechanism
The factor f is the dimensionless ratio of actual concentration to nominal concentration.
NaOH can absorb moisture and CO₂, so mass alone does not establish its actual concentration.
Relationships and conditions
Find fB by equating acid and base equivalents. The actual base concentration is NB × fB.
Use consistent reaction equivalents and volume units. The reference link is an official information portal; it does not mean these model conditions were verified against the current Food Code.
What to observe in the food simulation
The factor is the dimensionless ratio of actual to nominal equivalent concentration. N and M have the same numerical value for acid–base reactions of NaOH, but not in general.
This is the food-edu-v1 educational model. The 30 seconds is a simulated observation criterion, not an official test condition. Real NaOH is corrosive and releases heat when dissolved; protective equipment and supervision are needed.
Key relationships and symbols
fB = NA × fA × VA / (NB × VB), VB = r1 − r0
| Symbol | Meaning | Unit |
|---|---|---|
| f | Actual concentration / nominal concentration | 1 |
| N | Equivalent concentration | eq/L |
| VB | Base volume used | mL |
Worked food-analysis example
How does the factor change when more NaOH is needed to neutralize the same acid?
With other conditions fixed, the factor decreases. Volume used is the final reading minus the initial reading, not the final reading alone.
Common misconceptions
- Weighing exactly 1.000 g does not guarantee a factor of 1.