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NaOH solution preparation and standardization
Home / Food Lab / NaOH solution preparation and standardization
NaOH solution preparation and standardization
Distinguish theoretical mass from actual concentration and determine the factor by titrating standard acid.
Food Lab · NaOH standardization
An educational model. It does not replace actual test conditions or safety procedures.
Standardization and standardization factor
Nominal and actual concentration
Standardization determines a solution’s actual concentration by reaction with a reference solution.
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.
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.
Weighing exactly 1.000 g does not guarantee a factor of 1.
An independent educational simulation. Not affiliated with or endorsed by HRD Korea, Q-net or MFDS. Virtual results do not establish food safety or guarantee exam success.
Food Lab · Solutions & titration / principles and inquiry
NaOH solution preparation and standardization: experiment guide
Theoretical mass and actual concentration can differ. Titrate NaOH with standard acid and obtain its factor from three valid records.
How does it work?
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.
Key relationship
fB = NA × fA × VA / (NB × VB), VB = r1 − r0
Try this investigation
After weighing, dissolve, cool and transfer quantitatively, then fill to the 250 mL mark. If you overfill, prepare a new solution.
Titrate 25.00 mL of standard acid and check for pale pink after mixing. Record initial and final readings and volume used each time.
Compare the effect of a 0.20 mL air bubble in the same prepared solution. Exclude records with bubbles from the valid mean.
Interpreting your results
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.
Assumptions and limitations
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.
