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.
Bedrest characteristically fails to relieve fatigue. People with extreme fatigue experience profound tiredness and lack of energy that persist despite adequate rest and sleep. Because the body requires oxygen to generate energy, diseases and conditions that disrupt the delivery of oxygen to the body tissues often cause severe fatigue.