Essay on IB biology assesment- the effect of heat on vitamin c

8 test tubes were then labelled A-H, 1ml of DCPIP was added to each of the test tubes. 2ml of NaHCO3 was added tubes A through G.

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

Step 3: Use the thermometer to identify and record the temperature for room temperature, in your refrigerator, in your freezer, and then research the temperature of boiling water (do not take this temperature) and record them in Table 2.

* By using the dropper and measuring cylinder, 3ml of 1% lipase was added into the test tube

11. The experiment was repeated three more times using different water temperatures (room temp water, cold temp water, hot temp water).

Once the water is at the desired temperature, place the small lamp 5cm away from the beaker and turn it on.

1.) Measure out 20ml out of the water and place it into a glass beaker

1. Fill up a 200ml beaker with tap water and then pour it into the designated jar

4.Measure 35mL of warm water and add them into each of the 4 test tubes at about roughly the same time. It is essential that the water is warm. Do not seal the test tube.

The volume of a small test tube and a thin-stemmed pipet were determined in this section of the lab. Water was poured into a small test tube until the water reached the very top edge of the test tube. The test tube was then emptied into a plastic 25 mL graduated cylinder and volume was measured and recorded into data table 3. A think-stemmed pipet was completely filled with water. Drops were carefully counted and emptied into the empty plastic 25 mL graduated cylinder until the water level reached 1 mL. The number of drops in 1 mL was recorded into data table 3. The thin-stemmed pipet had a total volume of 4 mL and that was also recorded into data table 3.

Dispense .5 mL water into the already weighed conical vial, replace cap and face insert on its down side.

In this experiment I will be finding out which fruit juice contains the most vitamin C. I will be using a method similar to titration but I will be using a syringe instead of a burette.

Vitamin C should be taken in through diets, fruits and vegetables so that it can have its best effects and is good for our health. Vitamin C supplements are only used as addition if our bodies do not have enough Vitamin C.

Water can be kept a constant by keeping the same amount of water in the beaker. Temperature- Enzymes are used in photosynthesis and the respiration of the plant. Therefore, increasing the temperature will increase enzyme reaction and the photosynthetic rate until a certain point is reached when the enzymes denature. The temperature can be kept somewhat a constant by performing the experiment in one session, when the air temperature shouldn't change enough to affect water temperature. A transparent glass block will also be placed in front of the lamp to retain some of the heat from the lamp.

In each experimental run, the volume of electrolyte used is always kept to be 150cm3. This is measured using a 250cm3 measuring cylinder