Page 63 - PC 101 practical notes 24-25..

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

So the resulting solution will be acidic and so it can be titrated

against 0.1 N NaOH (E.P 3).

E.P 3 ≡ 2 glyceroboric acid ≡ 2 H 3BO 3 (from borax)

E.P 1 ≡ 2 NaOH (from borax)

E.P 2 ≡ 4 H 3BO 3 (from borax)
E.P 3 ≡ 2 H 3BO 3 (from borax)

1
 E.P3 = E.P1 = E.P2
2

[
Other Questions :

1- Explain the following:

Borax can be determined by 3 methods.

Answer: Explain (E.P 1), (E.P 2) and (E.P 3) as mentioned before.

2- Complete the following:

a- Borax can be regarded as a half-neutralized boric acid solution after

the addition of ...............

(Answer: glycerol)

b- If a borax solution is treated directly with glycerol, the pH of the

resulting solution will be ............... to ph.ph. and the solution can be

regarded as a half-neutralized ............... solution.

(Answer: acidic – boric acid)

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