Volume/volume percent = x 100 % Volume of solute =volume of solute Volume of solution Volume/volume % x volume of solution 100% {70% x 500 m L}÷100% = 350 m L 350 m L of C3H7OH alcohol is used to make 500 m L of 70% (v/v) rubbing alcohol.
Updated October 25, 2017 By Julie Revel
Creating dilutions reduces the concentration of one liquid with the addition of another. In order to create 70 percent isopropyl alcohol, a solution of isopropyl alcohol with a concentration greater than 70 percent must be diluted by a calculated amount of water. The formula for this calculation is C1_V1=C2_V2, where C1 and V1 is the starting concentration and volume of the solution and C2 and V2 is the final concentration and volume of the dilution. For the purpose of this example, the initial solution is 100 percent isopropyl alcohol, creating a final volume of 500 mL of 70 percent isopropyl alcohol.
Put on protective goggles and gloves before working with any liquids.
Identify the initial concentration of the 100 percent isopropyl alcohol, which is the C1 variable in the equation. The variable C1=100.
Determine the desired concentration and volume of the final solution to obtain C2 and V2. In this instance the final concentration C2 is 70 percent and final volume V2 500 mL; So C2=70 and V2=500.
Solve the equation C1_V1=C2_V2 for the unknown variable of V2. Substitute known variables: 100_V1=70_500, V1=35000/100, V1= 350. It is determined that 350 mL of 100 percent alcohol is needed for the preparation.
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Add 350 mL of 100 percent isopropyl alcohol to a 500 mL graduated cylinder. Ensure that the measurement is read at eye level with the meniscus, the bottom of the curved liquid, at 350 mL.
Add an additional 150 mL of water to the graduated cylinder for a total volume of 500 mL, again measured at eye level.
Pour remaining solution into a new beaker marked 70 percent isopropyl alcohol and stir with a glass rod.
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volume of isopropyl alcohol is used to make 500mL of rubbing alcohol?Using this equation,Volume/volume percent =x 100 %Rearrange to solve for volume of solute:Volume of solute ==350 mL of isopropyl alcohol is used to make 500 mL of 70%(v/v) rubbing alcohol.volume of soluteVolume of solutionVolume/volume % x volume of solution100%70% x 500 mL100%= 350 mL Concentration in parts permillion or parts per billionppm – parts per million(106)(one part solute permillion parts of solution)ppb – parts per billion (109)(one part solute per billionparts of solution)Usually mass/mass relationships ie. The mass ofsolute compared with the mass of solution.ppm =x 106ORmass of solute (g)Mass of solution (g)Mass of soluteMass of solutionx g106g of solution= Mercury poisoning becomes apparent when aperson build up more than 20.mg of Mercury intheir body. Express this amount as ppm for a60.kg personYou must first convert everything into grams•20mg/1000g = 2.0 x 10-2g•60kg/1000g = 6.0 x 104g•Ppm =mass solutex 106mass solution=2.0 x 10-2gx 1066.0 x 104g= (3.33 x 10-7g) x 106= .33 ppm Homework•8.6 Homework- molarity•8.7 Homework % concentration End of preview. Want to read all 12 pages? Upload your study docs or become a Course Hero member to access this document Chemistry, Mass, Parts per notation, 7g, 0 9, 0 9g, 4 00g > Suggest Corrections 4 |
What volume of isopropyl alcohol is used to make 350 mL of 70 rubbing alcohol
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