2. Make a 1/10 dilution of the 3.5% NaCl stock solution by adding 1 mL of the 3.

Question

2. Make a 1/10 dilution of the 3.5% NaCl stock solution by adding 1 mL of the 3.5% solution to 9.0 mL of water in a test tube. Lable this test tube as 0.35%. Seal the test tube with a piece of parafilm and invert the test tube several times to mix the contents. 1/10 dilution of 3.5 % NaCl = 1/10 x 3.5% = 0.35% NaCl = ________ mu g/mL 3. Make a 1/25 dilution of the 0.35% NaCl solution by placing 2 mL of the 0.35% NaCl solution into a 100-mL pour beaker and use a 50-mL graduated cylinder to add 48 mL of H2O to the beaker. Add a parafilm seal and swirl the beaker to mix the contents. What is the concentration of this solution? _______% NaCl; mu g/mL

Explanation / Answer

1. 3.5ug/ml

2.0.48% NaCl and 4.8 ug/ml

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