How to Calculate Concentration From Density
- 1). Divide the solute's mass by its molar mass. If, for instance, the solution contains 30 grams of silver nitrate, which has a molar mass of 169.88: 30 / 169.88 = 0.176 moles.
- 2). Add the mass of the solute to the mass of the solvent. If the silver nitrate is dissolved in 70 grams of water: 30 + 70 = 100 grams.
- 3). Divide this answer by the solution's density. If its density is 1.622 grams per cubic centimeter: 100 / 1.622 = 61.65. This answer is the solution's volume, measured in cubic centimeters.
- 4). Divide your answer by 1,000 to convert it to liters: 61.65 / 1,000 = 0.06165.
- 5). Divide the answer to Step 1 by the answer to Step 4: 0.176 / 0.06165 = 2.85 moles per liter.
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