Typical blood serum is about 0.14 M NaCl. What volume of blood contains 1.0 mg NaCl?

Question

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Answer 1

molar mass NaCl = 58.44 g/mol

0.14 M NaCl means 0.14 moles of NaCl in 1 Liter of blood. Let's convert this to mg NaCl per ml of blood.

0.14 mol/L x 58.44 g/mol x 1000 mg/g x 1 L/1000 ml = 8.2 mg/ml

So, there would be 8.2 mg of NaCl in 1 ml of blood. To get 1.0 mg of NaCl we would need....

8.2 mg/ml (x ml) = 1.0 mg

x = 0.12 mls of blood needed