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.
Cancer has many factors that causes excessive fatigue, such as: 1  weight loss, 2  breakdown of the tissues with release of energy, 3  hormonal imbalances,  depression and anxiety, which by themselves can cause 1  fatigue, sleep disruption can also lead to sleepiness and fatigue,