complexprelab - 2. Make the indicator solution by mixing 4...

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Steven Hagedon Danielle Nguyen, Ashley Cox, Grishma Sheth Yan Zhao Chem 104B-027 2-24-2008 Pre-lab: The Water Project- Step 1: Complexometric Titrations Problem to be solved To determine the presence of metal cations in a solution through the use of a titration, which involves the formation of complex ions and helps to determine the hardness of water. Fundamental Principles: M +n + EDTA -4 M-EDTA +(n-4) (M=any cation) Equilibrium expression= K f =[M-EDTA +(n-4) ]/[M +n ][EDTA -4 ] Strength of bond of EDTA depends on ion charge and size of ion Moles M +n = moles EDTA Materials Beaker, Buret, Erlenmeyer flask, Stirring Bar, Watch glass Procedure 1. Make a .085 mol/L solution of EDTA = 31.6408 g/L
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Unformatted text preview: 2. Make the indicator solution by mixing 4 grams of Eriochrome Black T into 20 mL of distilled water. 3. Fill buret with EDTA solution 4. Place 20 mL of water sample in beaker. 5. Begin titration and record. 6. Repeat tirations three times, however, if the titration volumes are between 10 and 40 mL, consider changing the sample volume or making new EDTA solution 7. Endpoint will be indicated by a blue color in sample Data Tables Mass of EDTA (g) Volume of Water Sample (mL) Mass of Erio T (g) Volume of EDTA used to Titrate sample (mL) Trial 1 Trial 2 Trial 3...
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complexprelab - 2. Make the indicator solution by mixing 4...

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