- 1). Determine the sodium hydroxide's concentration. This value will be printed on the solution bottle's label. For this example, imagine a solution of 1.5M NaOH.
- 2). Convert the solution's volume to liters. If you have, for instance, 100 cubic centimeters of solution, divide by 1,000 -- 100 / 1,000 = 0.1 liters.
- 3). Multiply the solution's molarity by its volume -- 1.5 x 0.1 = 0.15 moles. This is the number of moles of sodium hydroxide in the solution.
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