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Building A Titration Station for easy, accurate Titrations by Chris Erickson of Teton Valley, Idaho/Wyoming Questions? Comments? Feedback? Click Here The self-zeroing buret is the key piece of labware you will need for a very accurate, easy to use Titration Station. The buret is a graduated glass cylinder that gives a reading accurate to 0.1 milliliters. It is easily refilled and it always resets itself to zero. During titrations, you simply open the buret’s valve allowing titrant to slowly drip into your sample. No need to count drops because when your titration goes to completion you just read your result from the graduations on the cylinder. It is fast and allows you to easily perform several titrations which can then be averaged so you are assured of using the correct amount of catalyst for your biodiesel transesterification. The preparation of titrant (commonly 1g NaOH or KOH per 1000ml water) and sample (typically 1ml of oil in 10ml isopropyl alcohol) remains the same as you would normally do. The buret replaces the eyedropper used to perform titrations.
Scientific
suppliers sell many different kinds of burets at many different
prices. The LaMotte company in Maryland sells this inexpensive
version of self zeroing buret which uses the plastic squeeze bottle
to fill. Other models use a glass bottle which incorporates a
separate rubber bulb for filling the buret (more complicated and
expensive). LaMotte also sells a stand to hold the buret, a homemade
stand can do the same for very little money. LaMotte sells to the public and can be reached at: 1 800 344-3100, www.lamotte.com It is also available at: www.coleparmer.com and www.b100supply.com
Chris
Erickson Teton
Valley, ID and WY January
20, 2005 |
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Collaborative Biodiesel Tutorial - Copyright 2005 |