A solution of aqueous ferric chloride has a concentration of 15 ppm. What does this tell us about the amount of ferric chloride in the solution?
A) There are 15 grams of ferric chloride in every 1,000,000 grams of solution.
B) There are 15 grams of ferric chloride in every 1,000,000 mL of solution.
C) There are 15 mL of ferric chloride in every 1,000,000 mL of solution.
D) Both A and B are correct.
Question 2
Which of the following features about a thromboplastin preparation is necessary for accurate results?
A) Serial dilutions must be made of the thromboplastin preparation and measured to create a standard curve.
B) The international sensitivity index (ISI) of the thromboplastin preparation should be close to 1.
C) The thromboplastin preparation must be made by and purchased from the International Standardization Committee.
D) The thromboplastin preparation must be tested and certified by the World Health Organization (WHO).
Primary production increases with an increase in total phosphorus concentration.
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