Ascorbic Acid Content Of Orange Juices Lab Report

The number of moles of ascorbic acid neutralized in the experiment is given by multiplying the moles of NaOH used (0.00235128 mol) by the unit conversion coefficient (1 mol ascorbic acid/1 mol NaOH).

Data Tables and Observation: Fill out the data sheet (below) for the experiment and submit with this form. Recording data carefully

The vials were placed in the water and the oxygen levels were read every 5 minutes until 30 minutes was reached. As the oxygen levels were collected they were put into a table that had all three tubes labeled at each 5-minute increment. After 30 minutes the experiment was completed and the clean up process could begin.

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.

3. At this point, you are ready to begin the lab exercise. Click on the “Information” button on the blood

2.Heat stove at a medium-high heat (7/10 on most stove units); let it heat up for 3 minutes

Record the results of your investigations of each unknown in Table 1 by completing the following steps:

Complete the experiment and save the PDF lab report. Do not answer the questions in the PDF lab report. Use the data in the PDF lab report

Place the beaker on the hot plate, place the thermometer in the beaker and set the hot plate to 5oC.

Fill a test tube about 1/3 full with cold tap water for use in step 34.

The titration worked well and yielded decent results. It was found that 72.10 mg of ascorbic acid is contained within a serving of lemonade.The %w/w of ascorbic acid is .30%. The volumes collected and observations made worked out to give proper and expected values. Rinsing the burette and pipette was important to this as it removed any water or dust inside. This meant that final volumes and calculations were more precise as there were fewer sources of error. The standard deviation obtained from the four trials was 0.22 mL. Much of this error is due to the rapid colour change. This made it difficult to precisely end the titration when the endpoint was reached. Another source of error is found in the assumption that because a colour change happened the proper reaction had occurred. This assumption while very basic and small potentially had a slight impact on final results. Titrations are very simple and therefore are empirical, and based off simple measurements with these simple assumptions accuracy decreases and error

2. Fill a flask with pure water (0% sugar), another with 0.2M water, another flask with 0.4 M water, and another flask with 0.8M water.

Can red cabbage juice indicator be used to determine the strength of acids and bases? Explain.

Orange Juice Materials: Three oranges were used for this experiment to obtain a decent amount of juice. Each orange was cut in half and juiced according to steps 1 and 2 of Appendix I of the Laboratory Manual for Biology 201 (Denniston, Wimmers, & Hemm 2015). The juice from the first orange and one half of the second orange was strained into a small beaker following

Rinse the thermometer with tap water and dry. Insert the thermometer in the calorimeters top and measure the initial temperature of the base 28.2∘C