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Determination of 70% HF strength determination



(-----) February 19, 2008

Am working in the Mining Industry and am using 70% HF for ore treatment. I need a reliable method (wet or instrumental) that I can I can use to gauge the strength after a number of treated batches.

Modise Molale
LAB EMPLOYEE - Gaborone, Botswana
^


February 27, 2008

In Situ Method:

Mount and polish a sample and evaluate it in the microscope. Then you will be able to know the capacity (power) of your solution.
If you want to refresh your solution, then use titrations.

Jose Castellanos
Minneapolis, MN, USA

Jose Castellanos
- Minneapolis, MN, USA
^


February 27, 2008

Working with 70% hf is extremely dangerous, including the white cloud of fumes that comes off of it.
One way to check it is to do a titration with a ion specific electrode and appropriate standards and quench solutions.
If there are no other acids, you can do a simple acid base titration with 1N or 0.5N sodium hydroxide to a methyl orange or similar pH color indicator.

James Watts
- Navarre, Florida
^

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