if the chemist mistakenly makes 275 ml of solution instead of the 200ml, what molar concentration of sodium nitrate will the chemist have actually prepared

To calculate the molar concentration of the sodium nitrate solution, we need to know the number of moles of sodium nitrate dissolved in the solution and the volume of the solution.

In this case, we know that the chemist mistakenly made 275 ml of solution instead of the desired 200 ml. However, we don't have any information about the amount of sodium nitrate used or its molar concentration. Therefore, we cannot determine the molar concentration of the solution without additional information.

If you have the additional information, such as the mass or moles of sodium nitrate used to prepare the solution, I can help you calculate the molar concentration.

The new molarity is 200/275 of what she intended.