Page 65 - PC 101 practical notes 24-25..

MANSOURA NATIONAL UNIVERSIY
PHARM D- CLINICAL PHARMACY LEVEL I PHARM. ANAL. CHEM. I (PC 101)

For the second method:

Na 2B 4O 7 + 7 H 2O → 2 NaOH + 4 H 3BO 3

Boric acid + 2 glycerol → [Glyceroboric complex] H + 3H2O

[Glyceroboric complex] H + NaOH → [Glyceroboric complex] Na + H2O
titrant

 1 Borax ≡ 4 Boric acid ≡ 4 glyceroboric acid ≡ 4 NaOH

1
 1 NaOH ≡ Borax
standard 4 sample

Equivalence factor (F):
1 x M.W. of borax x 0.1

each ml of 0.1 N NaOH ≡ 4 ≡ ........ g borax
1 x 1000

Concentration:
E.P 2 x F x 1000
Concn. of borax = = .......... g/L
10

Results:

E.P 1 =

E.P 2 =

Concn. of borax (1st method) =

Concn. of borax (2nd method) =

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