Purpose: The purpose of this lab is to purify as much foul water as possible by doing three procedures which are, oil water separation, sand filtration, and charcoal absorption / filtration . Procedure 1) Obtain approximately 100 mL (milliliters) of foul water from your teacher. Measure its volume precisely with a graduated cylinder; record the actual volume of the water sample (with units) in your data table. 2) Examine the properties of your sample: color, clarity, odor, and presence of oily or solid regions. Record your observations in the “Before treatment” section of your data table Materials Foul water Bright light Goggles Animal Charcoal Filtration paper 2-150 ml Beakers Sand Gravel Disposable cup Funnel in clay triangle Apron DATA TABLE Volume (mL) Color Clarity Odor Presence of oil Presence of Solids Before Treatment 50 Green No Yes Yes Yes After oil-water separation 47 Green No No A little bit Yes After sand filtration 45 Green More clear No No No After charcoal absorption and filtration 40 Yellow Yes No No No Post-lab Activities 1. a.
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Our water has electrolytes which means the water acts as transporter of electricity. Our teacher tested the water with a bulb and it worked. In contrary of tap water. b. Then to distil the water keep it at a temperature of 100 oC, so it will vaporize. Channel the vapor through a cooling condenser, and collect the condensed vapor.
c. When it reaches the end stop the process through the small amount left in the bottom, because it could be dirty. We have got pure water Post lab activities 1. Your teacher will demonstrate distillation, another technique for water purification. a. Write a description of the steps in distillation.
Steps for distillation o Heat the liquid to its boiling point o Chanel the vapor through a cooling condenser. o Collect the condensed water. o Don’t over heat the sample. b. Why did your teacher discard the first portion of distilled water? Because the dirt was concentrated in this area. c.
Why some liquid was purposely left in the distilled flask at the end of the demonstration? 2. Your teacher will organize the testing of the electrical conductivity of purified water samples obtained by your class. This test focuses on the presence of dissolved, electrically charged particles in the water. You will also compare the electrical conductivity of distilled water and tap water.
What do these test results suggest about the purity of your water sample? It’s not pure. 3. Your teacher will test the clarity of various water samples by passing a beam of light through each sample. Observe the results. The differences are due to the presence or absence of Tyndall effect. What does this suggest about the purity of you water sample? It’s really dirty compared to tap water.
Calculations 1. What percent of your original “foul water” sample did you recover as “purified water”? Percent of water purified = volume of water purified X 100% Volume of foul water sample 40 ml/50 ml X 100 = 80% I recovered as purified water. 2. What volume of liquid did u lose during purification? I lost 10 ml of the liquid during purification.
3. What percent of you original foul-water sample was lost during purification? 20 percent of my original foul.
