Determination of lead by edta titration Back Titration

Determination of lead by edta titration Back Titration

  11:34 AM    yallascience

---

Determination of lead by EDTA titration Back Titration

Complexometric titration of a lead Pb with EDTA is very simple, this type of determination of lead by EDTA titration is according to EDTA titration. This method is useful for determination of lead in water and solutions.

PRINCIPLE

Lead may be titrated with EDTA over several pH ranges using a variety of indicators
by direct or back procedures. In This experiment, we describe the determination of lead
by Complexometric back titration at pH 10 using Eriochrome black T as an indicator. The
color change and mechanism of titration are:

Determination of lead by EDTA titration Back Titration

Also, you can see the: Determination of zinc ion by EDTA titration &: Determination of Magnesium

REAGENTS

1- Lead ions solution (analyte)
2- Eriochrome black T indicator
3- Standardized 0.01 M zinc sulfate solution
4- 0.01 M EDTA solution

PROCEDURE

1- Pipette 25.0 mL of Lead ions solution into a 250.0 mL and add an excess known amount of 0.01 M EDTA solution (V EDTA) and add 2-3 mL buffer solution pH 10.
2- Add 50mg of Eriochrome black T indicator and titrate rapidly with standard 0.01 M zinc sulfate solution until the color changes from blue to wine red. Record the used volume (as VZn).
3- Repeat the titration twice.

Atomic weight of Lead= 207.2 g/mol

As you Know, you can determination of aluminum by back titration