Narrative Report Dna

prevent solution evaporation which is to cool the flask and doesn 't allow the solution to evaporate. The

Next, I poured distilled water just below the 250ml mark on the neck of the volumetric flask.

Put 1 cup of cold water in one cup and 1 cup warm water in the other cup

21) After all of the solid dissolves, move the flask from the hot plate and allow it cool to room temperature. After a while, crystals should appear in the flask.

A cold, wet pipe cleaner was then added to the top of the reaction flask to keep the column cold which caused no vapors to rise into the column.

6.Once timer has gone off after 30 seconds, quickly remove pot from heating surface and quickly pour into bowl.

9) Trial E: Remove the syringe and empty the beaker. Add a Thermometer to the beaker. Add 200 mL of Room Temperature water to the beaker and heat with a Bunsen Burner until it reaches 100° C. Remove the Bunsen Burner. Repeat Steps 5 & 6.

Working in the hood or a designated work area, add about 1 mL of ethyl alcohol to a clean evaporating dish. Place the evaporating dish on a heat- resistant pad.

1. Gathered all required materials to designated lab bench. 2. Considered all safety precautions including the prevention of spilling water to avoid falls, handling glassware carefully to prevent shattering, avoiding long periods of working with warm water to avoid burns and avoiding the digestion/inhalation of by-products produced after the reaction (e.g. ethanol and carbon dioxide gas). 3.

14) Let the crystals of the silver settle in the plastic container and decant off the liquid.

After cooled down a little, mix with a glass stirring rod until sample is uniform in texture and appearance, then re-weigh the sample.

Attach your paperclip to your beaker, and lower your seed crystal into your solution (See Figure

Place a burette on the conical flask and then hold it by using a clamp stand.

3. Use a sterile pipette to transfer 0.1 ml of each dilution on to a MacConkey agar plate.

1. Place the beaker containing the mixture on the hot plate and heat until the white fumes no longer form (about 15 minutes) during the sublimation process.