Pipette

was added to each of the test tubes and they were placed into an ice chest for 10 minutes. Then they were taken out and observed. Procedure Two Started out with three test tubes labeled water, cold, hot. In the correct tubes were distributed with pipettes 2ml of water, 2ml of fresh pineapple juice for the one labeled cold, and 2ml of fresh pineapple juice for the one labeled hot. The one that was labeled hot had been placed in to a hot water on the burners for five minutes. After it was taken…

because our technique was not sterile. For, instance the pipettes were shared around the table, it was easy to measure the volume with a wrong pipette, or to pipette with a used pipette tip (we were required to use a fresh pipette tip for each dilution). Moreover, failure to set the right volume on the pipette counts as an error as well. We were required to wear gloves throughout the experiment, but at some point, some of us touched the pipettes, PCR tubes etc. with our bare hands. Thus, these…

then downtown Grand Rapids, then Plainfield, and then Versluis lake. The procedure for Cornerstone pond and Versluis Lake are as follows: first, wearing waders, we walk about 3 feet into the water; then we open a sterile pipette and label a vial of nutrient broth; we use a pipette to deliver 3mL of water into the vial; then, we recap the vial and return it to the…

there is a presence of glucose among the fluids in between the intestine and circulatory system then there is to be a breakdown of starch molecules within the digestive tract . Materials: One small beaker, Two large beakers, Dialysis tubing, Plastic pipettes, Amylase, Cooked starch, Lugol’s solution, Glucose test strips, Tubing clamps Procedure: Once in groups and materials are obtained one is to place four full…

depend on the density, we might have multiple liquid and it not very accurate, but since we can determine the boiling point, the number of boiling point and density will help us to find out the most precise unknown liquid. The most precise is the pipette,…

germinating peas in the ten degree bath and in the room temperature bath were both using the oxygen to make glucose to support their growing cells/tissues, while both sets of dry peas weren’t consuming any oxygen; the water was being pushed out of the pipette instead. The rate of oxygen consumption for the germinating peas was higher in the room temperature bath (0.0413) than the rate of oxygen consumption in the ten degree bath (0.013). The results for the dry peas were the same, the rate of…

paper towels for the students to empty their well plates. Students: Obtain a pair of safety goggles from the goggle cabinet, a plastic reaction well plate for your group, two 250 mL beakers from station drawer to share with another group, 15 pipettes (each pipette labeled with the name of one aqueous solution) to share with another group, one glass stirring rod from the station drawers for you and your partner, a paper copy of the periodic table for your pair, a bottle of deionized water for…

culture of Bacillus subtilis. Pass the neck through the Bunsen burner flame 2-3 times. Remove a few drops of culture with the sterile dropping pipette. Flame the bottle neck again and replace the cap. Lift the lid of the Petri dishes. Place 2-5 drops of culture in the centre of the dishs. Replace the lid as quickly as possible. Discard the dropping pipette into the beaker of disinfectant. Take the bottle of melted agar. Remove the cap and pass the neck through the Bunsen burner flame 2-3 times.…

reach equilibrium or isotonic levels. Place 4 full pipettes of starch into a small beaker. Use a pipette to add 4 pipettes of α-amylase to the small beaker then stir. Open dialysis tubing from one end then tie the tubing with a clamp. Open the moist end and add 4 pipettes of the solution from the beaker into the tubing. Wipe clean the outside of the bag to remove any excess solution. In a large beaker add two-thirds of water then add 4 pipettes of Lugol’s reagent to the beaker. Place the…

Introduction Titration is a method where a solution of known concentration is used to find the concentration of an unknown solution. A standard solution is a solution of precisely known concentration. The aim of this experiment was to go over the use of pipettes, burettes, titrations and also to reinforce the concept of molarity. In this experiment, a titration was carried out using a standard solution of hydrochloric acid to establish the molarity of a solution of sodium hydroxide. The…