Lab 13 procedure - Acid Dissociation Constant 1 Use at...

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Acid Dissociation Constant 1. Use at least 25 mL of NaOH but less than 50 mL to determine how much unknown to use. 2. Obtain an unknown solution and weigh out 0.1 g into a clean 250 mL Erlenmeyer flask. Add enough water to dissolve the acid and then add 3 drops of phenolphthalein indicator. 3. Rinse a clean 50 mL burette with standardized NaOH. Fill the burette and titrate the unknown acid until the solution has a faint pink color. From the titration data on the 0.1 g sample, determine the number of grams needed to use approximately 25 mL of NaOH. 4. Weigh out one sample of your unknown acid into a clean 250 mL beaker. The mass of the sample
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Unformatted text preview: should be approximaTely The amounT you calculaTed would require 25 mL of The sTandardized NaOH. Add su´cienT distlled waTer To dissolve The sample and add 3 drops of indicaTor. 5. SeT up The Vernier apparaTus accordingly. 6. Record The pH and volume of NaOH as you tTraTe. Add The sTandard NaOH in 1 mL incremenTs untl The pH begins To change. Reduce The size of The incremenT To .1-.2 mL. As The pH begins To change more abrupTly, reduce The size of The incremenTs even furTher. Contnue The tTraton untl The pH does noT change signiµcanTly beTween successive additons of NaOH....
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  • Fall '08
  • Staff
  • Chemistry, 1 mL, ml, Erlenmeyer flask, 0.1 g

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