Question

A chemist prepares a solution of sodium chloride (NaCl) by measuring out 49. umol of sodium chloride into a 250. mL volumetric flask and filling the flask to the mark with water.
Calculate the concentration in mmol/L of the chemist's sodium chloride solution. Be sure your answer has the correct number of significant digits.

Answers

GPT 3.5
First, we need to convert the given amount of NaCl from micromoles to millimoles:

49. umol x (1 mmol / 1000 umol) = 0.049 mmol

Next, we need to calculate the concentration in mmol/L:

Concentration (mmol/L) = (0.049 mmol) / (250 mL / 1000) = 0.196 mmol/L

Therefore, the concentration of the chemist's sodium chloride solution is 0.196 mmol/L.