2-9 Weighted Averages-Percent Mixture Problems Name: _________________________________________ Pd________ 1) How many grams of water must be added to 8 grams of 25% sugar solution to produce a 10% sugar solution? Let g = grams of water + = Equation: 2) How many pounds of water must be evaporated from 70 pounds of an 8% starch solution to produce a 20% solution? – = Equation: 3) How many ounces of 75% antiseptic solution must be added to 60 ounces of a 15% solution to produce a 50% solution? + Equation: = Percent Mixture Practice Solve the following. Think about what is being added or evaporated. 1) How many milliliters of water must be added to 16 mL of a 25% salt solution to obtain a 10% solution? 2) How much water must be evaporated from 150 L of a 4% salt solution to leave a solution that is 6% salt? 3) How many liters of pure acid (100% acid) must be added to 20 L of a 20% acid solution to make a 50% solution? 4) A 40L solution of salt water contains 15% salt. What is the least amount of water that can be added to form a solution that is no more than 5% salt?