There are 200 mmoles NaOH/400ml. What is the molarity of the solution?
M = mmoles/mL
To find the molarity of a solution, you need to know the number of moles of the solute (NaOH) and the volume of the solution in liters. In this case, we have 200 millimoles (mmol) of NaOH and a solution volume of 400 milliliters (ml).
First, we need to convert the volume from milliliters to liters. Since there are 1000 milliliters in one liter, the solution volume is 400 ml ÷ 1000 ml/L = 0.4 L.
Next, we can calculate the molarity (M) using the formula:
Molarity (M) = Moles of solute (mol) / Volume of solution (L)
We have the moles of solute, 200 mmol. To convert this to moles, we divide by 1000, since there are 1000 millimoles in one mole:
Moles of solute = 200 mmol ÷ 1000 = 0.2 mol
Now we can substitute the values into the formula:
Molarity (M) = 0.2 mol / 0.4 L = 0.5 M
Therefore, the molarity of the solution is 0.5 M.