The document provides instructions for using a burette to measure liquids. It explains the steps as placing the burette on a retort stand, checking the volumetric graduation, opening the stopcock to allow liquid to fall through the funnel and into an Erlenmeyer flask below, and closing the stopcock after spilling. Safety precautions are also listed, such as being careful with glassware, not touching broken pieces, avoiding overheating, and positioning the flask correctly under the burette.

1. LABORATORY INSTRUMENTS

2. BURETTE 11/22/2011

3. 11/22/2011

4. 11/22/2011 USING A BURETTE First, we need a Retort stand to put the burette After spilling the liquid, we close the stopcock, on the bottom Now we spilt the liquid by a funnel Before spilling the liquid, we see the volumetric graduation The last step is to open the stopcok, on the bottom, In order that the liquid falls down

5. 11/22/2011 PREACAUTIONS Be carefully with the glassware Don´t touch the broken glassware Don´t touch the broken precision tap Not warm very much Put correctly the erlenmeyer under the burette

6. http://www.youtube.com/watch?v=ZmCTUB91HB4 11/22/2011