Course Hero Logo

Acid-Base Titration Curves - Molly McKeever March 9, 2016...

Course Hero uses AI to attempt to automatically extract content from documents to surface to you and others so you can study better, e.g., in search results, to enrich docs, and more. This preview shows page 1 - 3 out of 8 pages.

Molly McKeeverMarch 9, 2016Chemistry Lab-015Acids-Base Titration CurvesPurposeWith careful measurements, accurate observations and precise calculations, thepercentage of active ingredients in commercial cleaners was obtained. MicroLAB and the use ofthe technique titration, a way to precisely measure the volume added to a given solution, wereused to obtain data to perform calculations necessary to find the percentages of ingredients.A strong acid, or strong electrolyte, completely ionizes in a solution. A weak acid, orweak electrolyte, however only partially ionizes in solution. Half of equivalence point is whenhalf of the acid has been titrated, the pH at this point is equal to the pKa of the solution.Procedure & ObservationMicroLAB was set up to record pH and volume, the pH electrode was calibrated withthree solutions with pH’s of 4.0, 7.0, and 10.0. A plastic pop bottle was rinsed with deionizedwater, 16 mL of 2.5 M NaOH was added to the bottle, 400 mL of deionized water was also addedto the pop bottle. The bottle was mixed to create a diluted solution of NaOH.A buret was rinsed first with deionized water it was then rinsed three times with NaOHfrom the pop bottle, the buret was then filled with NaOH, proper buret technique was carried outto ensure accurate volumes were recorded, meaning some NaOH was released in a waste beakerto prevent air bubbles from giving false readings.In a clean 250mL beaker 25.00 mL of 0.1 M HCl, 100 mL of deionized water and 2 dropsof phenolphthalein were added. The pH electrode was rinsed in deionized water placed in the
beaker and was used to stir the diluted HCl solution. The original volume of NaOH in the buret

Upload your study docs or become a

Course Hero member to access this document

Upload your study docs or become a

Course Hero member to access this document

End of preview. Want to read all 8 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Spring
Professor
Staff
Tags
Chemistry, pH, Equivalence point, titration curve

Newly uploaded documents

Show More

Newly uploaded documents

Show More

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture