Standardization of NaOH using Sulphamic Acid

Preparation of Sulphamic Acid Standard solution
Weight of sulphamic acid       = 2.4320g
Volume of dH2O                     = 250mL
MW of Sulphamic acid           = 97.09g/mol
Mol of sulphamic acid             = 2.4320g
97.06g/mol                              = 0.02506 mol

*Weight sulphamic acid about 2.43g (take all 4 decimals). Use standard procedure to dilute into 250mL of distilled H2O in a volumetric flask. Keep for next step.

Standardization of NaOH solution (using standard sulphamic acid solution)

*The readings were done twice as the volumes prepared are separated into two 40L containers

Reading

Initial

End

Titran Volume (mL)
First

00.00

25.10

25.10

Second

23.15

48.25

25.10

Third

02.50

27.60

25.10

Average

25.10

Molarity 0.02506 = 0.9982 M

0.02510

First

0.10

25.40

25.20

Second

6.55

31.75

25.20

Third

11.00

36.20

25.20

Average

25.20

Molarity 0.02506 = 0.9943 M

0.02520

*Next step is to fill a 250mL conical flask with 25mL of sulphamic acid solution from the frist step using a 25mL bulb pipette. add 4 drops of Phenolphtalein solution. Fill a burette with the your prepared NaOH. Titrate the NaOH solution into the sulphamic acid solution until a faint pink colour is observe. Take note of the NaOH volume Needed. Proceed with the calculation in table above.

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