Understanding the Terms
* Molarity (M): Moles of solute per liter of solution.
* Millimolarity (mM): Moles of solute per milliliter of solution. 1 mM = 0.001 M
* NaCl: Sodium chloride (table salt)
Calculations
1. Convert mM to M: 140 mM = 140 x 0.001 M = 0.14 M
2. Calculate moles:
* Moles = Molarity x Volume (in liters)
* Moles = 0.14 M x 1 L = 0.14 moles
Answer: You need 0.14 moles of NaCl to make a 140 mM solution in 1 liter of water.
