Question

1) We start with 1.00 mL of normal saline in each one of five test tubes, labeled as 1, 2, ..., 5... 2. We start with 1.00 mL of normal saline in each one of five test tubes, labeled as 1, 2, ..., 5. We add 250 µL of 312.5 mg/mL tetracycline into test tube 1, mix the content well, then remove 250 µL of the solution from test tube 1 to test tube 2, and repeat the procedure until you reach test tube 5. You will end up with 1.25 mL of liquid in test tube 5, and 1.00 mL of liquid in all of the other test tubes.

What is the tetracycline concentration in test tube 5?

a) 0.1000 mg/mL

b) 12.50 mg/mL

c) 2.500 mg/mL

d) 62.50 mg/mL

e) 0.5000 mL

Circle the correct answer

1a) We have a solution containing 0.10 M of NaCl and 0.05 M of CaCl2. The total concentration is ["0.20", "0.25", "0.15"] mEq/L for cations, and ["0.15", "0.25", "0.20"] mEq/L for anions.

Answer 1