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The formula for converting concentration from ng/mL to molarity is:
\( \text{Molarity (M)} = \frac{\text{Concentration (ng/mL)}}{\text{Molar Mass (g/mol)} \times 1000000} \)
Let's say we have a solution with a concentration of 5000 ng/mL, and the molar mass of the substance is 58.44 g/mol (like sodium chloride, NaCl). The molarity would be calculated as follows:
\( \text{Molarity} = \frac{5000 \, \text{ng/mL}}{58.44 \, \text{g/mol} \times 1000000} = 8.57 \times 10^{-5} \, \text{mol/L} \)
So the molarity of this solution would be \( 8.57 \times 10^{-5} \) mol/L.