Search results
Dec 10, 2023 · The most common unit of concentration is molarity, which is also the most useful for calculations involving the stoichiometry of reactions in solution. The molarity (M) is defined as the number of moles of solute present in exactly 1 L of solution.
Nov 13, 2022 · Solution. 5 ppm (w/v) means 5 grams of oxygen in one million mL (1000 L) of water, or 5 mg per liter. This is equivalent to (0.005 g) / (32.0 g mol –1) = 1.6 × 10 –4 mol.
Jun 10, 2019 · The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution. A concentrated solution is one that has a relatively large amount of dissolved solute. A dilute solution is one that has a relatively small amount of dissolved solute.
Symbol: M. M = moles / liter. Example: What is the molarity of a solution of 6 grams of NaCl (~1 teaspoon of table salt) dissolved in 500 milliliters of water? First, convert grams of NaCl to moles of NaCl. From the periodic table: Na = 23.0 g/mol. Cl = 35.5 g/mol. NaCl = 23.0 g/mol + 35.5 g/mol = 58.5 g/mol.
Oct 5, 2013 · Percent means per 100 parts, where for solutions, part refers to a measure of mass (μg, mg, g, kg, etc.) or volume (μL, mL, L, etc.). In percent solutions, the amount (weight or volume) of a solute is expressed as a percentage of the total solution weight or volume.
Learn how to dilute and concentrate solutions. Often, a worker will need to change the concentration of a solution by changing the amount of solvent. Dilution is the addition of solvent, which decreases the concentration of the solute in the solution.
Solution: Using the dilution equation, we write: (1.50 mol/L) (53.4 mL) = (0.800 mol/L) (x) x = 100. mL. Notice that the volumes need not be converted to liters. Any old volume measurement is fine, just so long as the same one is used on each side.
