lab4 - Petras/Willner1 Determining Concentration of...

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Petras/Willner 1 Determining Concentration of Phosphates in Water through  Titration Kaelyn Petras Jenny Willner October 12, 2006 LBS171L Section 008 TA: Merideth Lindeman Fitzpatrick
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Petras/Willner 2 I. Abstract-   Titration was used to find the average concentration of  phosphates in four different water samples. Manganese Sulfate was  added to the phosphates. The water solution was then titrated into an  EDTA solution.  When the EDTA solution turned colors, the  Phosphate/Manganese Sulfate solution equaled the amount of EDTA  in the solution.  The average molarity of phosphates in water is 55.56.  All samples of water (Red Cedar, tap, purified, and distilled) have the  same level of phosphates.   II. Introduction-  Phosphate, or PO 4 3-   is a common polyatomic ion.  It is  often found in detergents or fertilizers.  Often near bodies of water,  fertilizers or pollutants run into them, causing pollution or abnormal  levels of phosphates. By testing different water samples, one being the  Red Cedar, determining phosphate levels can be done. Using the Lab  2 MnSO Titration of EDTA, phosphates in water, mixed with solid  manganese sulfate was titrated into the EDTA solution given in the  previous lab.  Manganese, based on electronegativity and bonding  reactivity, was used to bond to the phosphates in the water.  Because  a given amount of manganese was added, the phosphates could be  calculated after the titration. III. Experimental-  Four samples of water were taken- one from the Red  Cedar River, tap water, purified water, and distilled water.  These  samples were measured and placed in eight different flasks.  Roughly  one gram of solid Manganese Sulfate was added to the four different  water samples.   An EDTA solution was made in a 250 ml beaker by  adding .37 grams of EDTA, 1 ml of ammonium and 100.00 ml of 
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This note was uploaded on 03/19/2008 for the course LBS 171L taught by Professor Sweeder during the Fall '06 term at Michigan State University.

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lab4 - Petras/Willner1 Determining Concentration of...

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