Lab_Report

Design of Experiment Lab Purpose: What is the best and cheapest method that will remove a grape stain on a piece of white cloth' The variables in this experiment include: 1. Cold water or hot water ($0.02) 2. 2% soap ($0.01) 3. No bleach or 2% bleach ($0.04) Hypothesis: The cold water and the bleach 2% will remove the stain the best and the Hot water and no bleach will not remove the stain at all. Procedure: 1. Take out 8 cups and label 4 of them with a sharpie marker “Hot water” and the other 4 “Cold water” 2. label one hot water cup and one cold cup “bleach 2%” then label two other hot and cold cups “no bleach” then another hot and cold cup “soap 2%” then finally label the last two hot and cold cups with “bleach and soap” 3. Cut out 8 stripes of the stained shirt using scissors(make sure they are all about the same size) 4. Fill the four “hot water” cups with 100mL of hot water and the other 4 “cold water” cups with 100mL of cold water. 5. Fill one hot cup and one cold cup with 20 drops of bleach and another hot and cold cup with 20 drops of soap then another hot and cold cup with 20 drops of soap and 20 drops of bleach. There should be one hot water cup and one cold water cup left with just water in it 6. Add the cut up stained shirts to each cup 7. Swirl/ mix together each cup for about 30 seconds each 8. Let each cup sit for 5 minutes 9. After 5 minutes look inside each cup and see which cup removed the stain the best 10. Take out the strips of the shirt from each cup and throw them away 11. Drain the water out of every cup into the sink 12. Clean up and wash down your table 13. Calculate the cost for each batch using the prices in the parentheses next to the variables Data Table: | |Cold Water |Hot Water | |Bleach 2% |2 |1 | |No Bleach |4 |3 | |Soap 2% |3 |3 | |Bleach 2% and Soap 2% |3 |2 | Key: 1= best; 2= good; 3= fair; 4= poor Calculations: - Cold water with bleach 2%= $0.06 - Cold water with no bleach= $0.02 - Cold water with soap 2%= $0.03 - Cold water with bleach 2% and soap 2%= 0.07 - Hot water with bleach 2%= 0.06 - Hot water with no bleach= $0.02 - Hot water with soap 2%= $0.03 - Hot water with bleach 2% and soap 2%= $0.07 Conclusion: In this experiment we learned that in order to remove a grape stain out of a white t-shirt with the best result you need to use hot water and 2% bleach. The next best is cold water and 2% bleach along with hot water with 2% bleach and 2% soap. Then after that you would do hot water with no bleach, cold water with 2% soap, hot water with 2% soap and cold water with 2% soap and 2% bleach. The combination that worked the worst was cold water with no bleach. We figured out the hot water with 2% bleach worked the best because when we looked at the cloth it was perfectly white. When we looked at the cloth with the combination of cold water and no bleach there was still a grape stain on it just as dark as when we first put it into the cup. My hypothesis states that the cold water and bleach would remove the grape stain the best which is incorrect. The bleach and hot water probably worked the best because the chemicals in the bleach react better when combined with hot water. You can use the DEO style for about any experiment. It is a very simple method and can be used for something little or even a very detailed experiment. You can use this method with types of toilet paper to see which one absorbs the most water. By doing this you would need at least 3 different brands of toilet paper. You can also use this one paper plates to test which one is more durable and sturdier. .