How is four ml of fifty mm nacl solution be prepared, Biology

How is four ml of fifty mm nacl solution be prepared

Problem: Paper Chromatography

a) If 25g of NaCl is dissolved into a final volume of 500mL, what is the percent (w/v) concentration of NaCl in the solution?

b) How is 4mL of 50mM NaCl solution be prepared from a 2M NaCl stock? Include a short instruction in the preparation.

c) What is the molar concentration of a 10% NaCl solution?

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