1. Place 10-30 ml (exactly measured) 0.01 M lead soluiton in 250 ml flask
2. Add a spatula end of tartaric acid.
3. Add 5 ml of buffer pH 10 and dilute to about 50-100 ml. If a turbidity occurs (Pb(OH)2
) add
more tartaric acid.
4. Add Erio T (too much will change the color intensity, so start small).
5. Titrate until the colour changes from violet just to clear blue.
6. Repeat twice to be able to report the rsd of the method.