Sodium hydroxide analysis of alkaline zinc(2001)
What indicator do you suggest I use for analysis of sodium hydroxide in alkaline non cyanide zincs? The one used at present is BDH 11-13 but this is no longer available.Philip Gormley
plating services - Irvine ,Ayrshire, Scotland
Try using Sulfo-orange or phenolpthalein. I use the sulfo-orange for cyanide based solutions. It might work. I use the phenolpthalein for alkaline cleaners.
I'm not at work until Tuesday, at which time, if you want I can try a couple of experiments and get back to you.K. Gendron
- Trenton, ON, Canada
1. 5 ml. sample into a 250 ml. flask.
2. Add 25 ml. 20 % barium carbonate.
3. Add 3 drops phenolphthalein indicator.
4. Titrate with 0.1 N hydrochloric acid, color change is pink to white.
5. mls. titrated x 1.06 = oz/gal.Bill Hemp
tech svc. w/ chemical supplier - Grand Rapids, Michigan
In response to the NaOH Titration procedure of Alkaline Zinc At our shop we use 5 ml sample 20 ml water A few specks of Indigo Carmine Indicator Titrate with 1.0N HCl from yellow to blue mls titrated * 0.95 = OZ/GAL * 7.5 = gms/ltLee Moss
- Calgary, Alberta, CANADA
We gave up on indicators and now use a pH meter and stirrer this gives more repeatable results. End point pH 11.2
surface treatment shop - Stroud, Glos, England
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