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Part 1: Take water from the Materials shelf and add 30 mL to the flask to dissolve the ascorbic acid. Complete the solution by filling the volumetric...
need help with the short answer questions (attached)
Part 1:
Take water from the Materials shelf and add 30 mL to the flask to dissolve the ascorbic acid. Complete the solution by filling the volumetric flask with water to the 100 mL mark by checking the "Fill to the Mark" box. This is the most precise way of making a 100 mL solution. Record the amount of ascorbic acid used and the total volume prepared in your Lab Notes. Remember to press Save Notes.: used .100g of absorbic acid. Volume: 30.1 mL
Add 20.0 mL of the ascorbic acid solution to the Erlenmeyer flask.
Take starch indicator solution from the Materials shelf and add 1.0 mL to the Erlenmeyer flask. : Volume: 67.5mL
Part 2:
Take 0.015 M iodine solution from the Materials shelf and add 50.00 mL to the burette. Record the initial burette reading in your Lab Notes. Pass the mouse over the burette and a gray tool tip will briefly display the total and dispensed volumes. You may want to use the + and - buttons in the lower right of the screen for a closer view. : Volume: 50.00 mL, Dispensed Volume: 0.00 mL
Perform a coarse titration, adding large increments (~ 2 mL) of the iodine solution from the burette by pressing and holding the black stopcock at the bottom of the burette for a few seconds. Pause after each dispensation. Record the volume dispensed in your Lab Notes. :
dispensed is 2.00mL and volume is 48.00 mL volume of erlenmeyer flask is 23.01 mL
dispensed 4.00 mL: volume is 46.00 mL, volume of flask 25.01 mL
dispensed 6.00 mL: volume is 44.00 mL, volume of flask is 27.02 mL
dispensed 8.00 mL; volume is 42.00 mL, volume of flask is 29.02 mL
color changed at 7.6 mL of dispensed volume
Part 3:
Take 0.015 M iodine solution from the Materials shelf and add enough to the burette so that the volume in the burette is 50.00 mL. Record the initial burette reading in your Lab Notes. 21.0 mL
Add titrant in small increments, down to one drop at a time, until the addition of just one more drop causes the solution in the flask to change color. Record the final total and dispensed volume reading in your Lab Notes.: Dispensed volume is 7.60 mL, volume of burette is 42.40 mL, Volume of flask is 28.62mL
Experiment 2:
Take 0.015 M iodine solution from the Materials shelf and add enough to the burette so that the volume in the burette is 50.00 mL. Record the initial burette reading in your Lab Notes.: Volume 50.00 mL, dispensed volume 0.0 mL
Perform a coarse titration, adding large increments of the iodine solution from the burette by pressing and holding the black stopcock at the bottom of the burette. Pause after each dispensation. Record the total and dispensed volumes in your Lab Notes. Volume of burette is 48.00 mL, dispensed volume is 2.00 mL, volume of flask is 43.01 mL
Dispensed volume is 4.00 mL, volume of burette is 46.00 mL, volume of flask is 45.01 mL
Dispsensed volume is 6.00 mL, volume of burette is 44.00 mL, volume of flask is 47.02 mL
Dispensed volume 6.7 mL, volume of burette is 43.30 mL and volume of flask is 47.72 mL THIS IS WHEN IT CHANGED COLOR
Add iodine solution in small increments, down to one drop at a time, until the addition of just one more drop causes the solution in the flask to change color. Record the final total and dispensed volume in your Lab Notes. Dispensed volume is 6.70 mL, volume of burette is 43.40 mL and volume of flask is 47.72 mL. CONFIRMED.
Repeat Experiment 2 using old orange juice (OJ – week old) instead of fresh orange juice. Volume is 41.0 mL
Dispensed volume: 2.00 mL, volume of burette 48.00 mL, volume of flask 43.01 mL
Dispensed volume: 2.7 mL, volume of burette 47.30 mL, volume of flask is 443.71 mL
