20.00ml Of Coles Multivitamin Juice
Conclusion
The amount of Vitamin C concentration in 20.00mL of Coles Multivitamin juice when titrated against a 0.0048M of iodine solution was 47.85792mg/100mL.
This result was much higher than the expected 10mg/100mL as presented on the label of the bottle. These inaccuracies may have been due to difficulty reading the burette, and troubles when identifying the endpoint which would have caused the results to be larger than expected.
It was very difficult to read the burette (as pictured in Figure 2) to 2 decimal places because there were only line measurements for one tenth of a millilitre whereas our results needed to be recorded to a hundredth of a millilitre. This required for us to estimate to a second decimal place and read in between the lines of the burette. As …show more content…
As we were looking from a angle of depression, it would cause the results to be even greater than expected. However, these issues were overcame after a few titrations and the burette was slowly emptied downwards.
Another difficulty which was experienced with the burette is that it would drip an extra drop or two after the tap was turned off. There is a possibility that the tap did not completely seal the hole and the iodine would seep out extremely slowly which would again, cause the results to be higher than expected.
One of the main contributors that caused the results to be higher than expected was that the exact end point was very hard to identify. It was especially difficult to know when the multivitamin juice had reached its endpoint as the original colour of the juice was dissimilar to those pictured in Figure 3 & 4. The colour was a mix of the freshly squeezed orange juice and red capsicum juice. The endpoint colour of my titration was a green-orange colour which is similar to the middle conical flasks in Figure 3 and
The amount of Vitamin C concentration in 20.00mL of Coles Multivitamin juice when titrated against a 0.0048M of iodine solution was 47.85792mg/100mL.
This result was much higher than the expected 10mg/100mL as presented on the label of the bottle. These inaccuracies may have been due to difficulty reading the burette, and troubles when identifying the endpoint which would have caused the results to be larger than expected.
It was very difficult to read the burette (as pictured in Figure 2) to 2 decimal places because there were only line measurements for one tenth of a millilitre whereas our results needed to be recorded to a hundredth of a millilitre. This required for us to estimate to a second decimal place and read in between the lines of the burette. As …show more content…
As we were looking from a angle of depression, it would cause the results to be even greater than expected. However, these issues were overcame after a few titrations and the burette was slowly emptied downwards.
Another difficulty which was experienced with the burette is that it would drip an extra drop or two after the tap was turned off. There is a possibility that the tap did not completely seal the hole and the iodine would seep out extremely slowly which would again, cause the results to be higher than expected.
One of the main contributors that caused the results to be higher than expected was that the exact end point was very hard to identify. It was especially difficult to know when the multivitamin juice had reached its endpoint as the original colour of the juice was dissimilar to those pictured in Figure 3 & 4. The colour was a mix of the freshly squeezed orange juice and red capsicum juice. The endpoint colour of my titration was a green-orange colour which is similar to the middle conical flasks in Figure 3 and