Using incorrect concentrations. If your vitamin C standard solution is too concentrated or your iodine titration solution is too diluted, or your starch indicator solution is not between 0.5 to 1.0%, it may require much more than 50 mL of iodine solution to titrate the standard solution and/or orange juice.
The following summarizes some common causes of fatigue but is not meant to be comprehensive: Metabolic/endocrine: anemia; hypothyroidism; diabetes; electrolyte abnormalities; kidney disease; liver disease; Cushing's disease.
The Most Common Reasons for Excessive Fatigue. Discovering the causes of extreme fatigue can be difficult if you don't know the distinctions between fatigue and sleepiness. Some disorders cause fatigue, others sleepiness, and some disorders cause a mix of these two.