1. Understand Molarity
* Molarity (M) is a measure of concentration, defined as moles of solute per liter of solution.
2. Convert Volume to Liters
* 300 mL = 0.300 L (since 1 L = 1000 mL)
3. Use the Formula
* Molarity = moles of solute / liters of solution
* We know the molarity (0.250 M) and the volume (0.300 L). We can rearrange the formula to solve for moles:
* Moles of solute = Molarity * Liters of solution
4. Calculate
* Moles of KOH = 0.250 M * 0.300 L = 0.075 moles
Answer: You would need 0.075 moles of potassium hydroxide to prepare a 300 mL 0.250 M solution.
