DECANTATION Group 7 WHAT IS DECANTATION? DECANTATION IS… A process for the separation of mixtures, carefully pouring a solution from a container in order to leave the precipitate (sediments) in the bottom of the original container. Usually a small amount of solution must be left in the container, and care must be taken to prevent a small amount of precipitate from flowing with the solution out of the container. In other words, Decantation is a process by which a liquid layer can be separated from the sediments. DIFFERENCE BETWEEN FILTRATION AND DECANTATION Filtration is the direct separation of the entire solution through a filter, where the solid is trapped on the filter and the liquid passes through. Decantation is pouring the liquid away from a precipitated solid, keeping the solid in the original container. SET UP TOOLS BEAKER (2) *for separation of the sediments from the liquid. STIRRING ROD SET UP STEPS STEPS O1. Mixture in the container is allowed to stand for sometime. O2. The solid particles will settle down in time. O3. The upper layer of the liquid gets cleaner. O4. Separate the coarse particles of a solid from a liquid by pouring the liquid to a new container by the process of decantation. WHEN IS IT USED? Decantation is used when one is separating parts of a mixture from another and when the particles or sediments are too fine to be filtered from a liquid. PRINCIPLES PRINCIPLES 1) Decantation is the "pouring off" of a liquid from a solid/liquid mixture. The mixture is allowed to settle, and the liquid is removed while preventing the solid from escaping. 2) Decanting is an effective method because it is simply pouring off the excess liquid from a product. ADVANTAGES AND Disadvantages ADVANTAGES a) Decantation is a quick method. b) It allows sediment to settle to the bottom of a container over a period of time. It cleans portions of a liquid from above the sediment in a container. DISADVANTAGES a) It cannot be used to separate a mixture of a liquid and a light sold, such as chalk in water. The particles of chalk are suspended in the water. They are so light that they do not sink down to the bottom for a long time. b) You won’t recover all of the solution. EXAMPLES O1. Mud particles in water. O2. Grease from the top of soup. O3. Liquid from the mustard O4. Brownish liquid from the tea bags pour in hot water. O5. Red wine, where the wine is decanted from the potassium bitartrate crystals. O6. separating the oil from water after getting them as a mixed liquid out of olives in order to extract olive oil. Sources: Decantation: Advantages and disadvantages. (n.d.). Retrieved September 2, 2009 from http://library.thinkquest.org/11430/research/decantation.htm Decantation. (2009). Retrieved September 2, 2009 from http://www.chemeurope.com/lexikon/e/Decantation/ Decantation. (2009). Retrieved September 1, 2009 from http://en.wikipedia.org/wiki/Decantation Mixtures: Sedimentation or decantation. (n.d.). Retrieved September 2, 2009 from http://www.tutorvista.com/content/chemistry/chemistryiii/chemistry-concepts/mixtures.php YAHOO ANSWERS: OPINIONS http://answers.yahoo.com/question/index;_ylt=Aitb0SOQ8.l9yAQPa_u5Tcgjz KIX;_ylv=3?qid=20080806074523AABVZge http://answers.yahoo.com/question/index?qid=20080317231430AAJd4y9 http://answers.yahoo.com/search/search_result;_ylt=An4iK4fRbKRFUZ9VA B6Oz3EExgt.;_ylv=3?p=Why+is+decantation+an+effective+method%3F http://answers.yahoo.com/question/index;_ylt=AgBT1AA6q8nkCD_h9ycYx w4jzKIX;_ylv=3?qid=20071129224601AADSsO4 http://answers.yahoo.com/question/index;_ylt=AvY9ljKrJ_3TWBgYLPa3Y5 AjzKIX;_ylv=3?qid=20090221091308AA1WAM3 Group 7 Alethea Chua Kat Albert Tanya Reyes Steffi Lagodgod 1-B