Name:______________________________ Concentration and Dilutions Reminder: C=m/V We measure concentration in g/L. 1. What is the sugar concentration of a cup of tea containing 0.25 L of tea and 5 g of sugar? 2. What will be the sugar concentration of the liquid if you pour the cup of tea into a pitcher containing 2.5 L of unsweetened tea? 3. Read the procedure below and perform the appropriate calculation. Procedure: 1. Gather materials 2. Place beaker on balance, tare scale. 3. Measure 500mg of solute in the beaker. 4. Dissolve solute in beaker, with a limited amount of solvent. 5. Pour solution from beaker into 100 mL volumetric flask. Fill volumetric flask with solvent. 6. Calculate the concentration of the solution created Diltution How would you create a solution with a concentration than one with a concentration of 4g/L? ____________________________________________________________________________ ____________________________________________________________________________ How would you decrease the concentration of a solution? ____________________________________________________________________________ ____________________________________________________________________________ Dilution is: ____________________________________________________________________________ ____________________________________________________________________________ Examples of Dilution in everyday life: _____________________________________________________________________________________ __________________________________________________________________________________ Calculation of dilution: ______________________________ C1 = ______________________ (strong) solution V1 = ______________________ (strong) solution C2 = ______________________ (weak) solution V2 = ______________________ (weak) solution Reminder: 12 % (m/V) means “ 12 g of solute dissolved in 100 mL of solution” 8 % (m/m) means “ 8 g of solute dissolved in 100g of solution” 10% (V/V) means “10 mL of solute dissolved in 100mL of solution” Try: A solution was made using 8g of solute and it has a concentration of 6% (m/m). What is the mass of the solution? Vinegar is really just 5% (V/V) acetic acid. What volume of acetic acid is contained in a 600 mL bottle of vinegar? Now try this and dilution! 1. How much of a 55 g/L salt solution do you need to prepare 750 mL of a 22g/L salt solution? 2. How much of a 25% (m/V) glucose solution do you need to prepare 50 mL of a 10% (m/V) solution? 3. How much of a 10g/L acid solution do you need to prepare 500 mL of a 2 g/L acid solution? 4. 2. How much of a 5% (V/V) alcohol solution do you need to prepare 250 mL of a 3% (V/V) alcohol solution? 5. Your mom asks you to buy and then make orange juice from concentrate for a party at your house. Here is the information from 3 cans of the juices on the market. Which will you buy? Your mom wants the lowest sugar content. A. volume of can = 550ml Sugar content = 62.15 g B. volume of can = 330 ml sugar content = 38.28g C. volume of can =275ml sugar content = 30.5g I will buy can _________ because _________________________________________________________________.