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4-Strong Acid Base Titrations

4-Strong Acid Base Titrations - Chemistry Titrations(7and11...

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Titrations and Acid Base  Chemistry Titrations (7 and 11) Buffers (9) Polyprotic acids (10) Alpha Plots (10) Mixtures
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Acid Base Chemistry Strong Acid/Strong Base Titrations Polyprotic Acid/Base Titrations Buffers Weak Acid Weak Base Titrations Alpha Plots Examples
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Volumetric Analysis: Acid Base Titrations
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What is Volumetric Analysis? Volumetric Analysis is based on measuring the volume of a solution of known concentration needed to completely react with a solution of unknown concentration. •Acid/Base. Precipitation reactions. Complexation reactions. Moles of Reagent 1 = Moles of Reagent 2 V 1 M 1 = V 2 M 2
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How an acid is titrated 1. Prepare a NaOH solution of approximate concentration 2. Standardize the NaOH standard with KHP. 3. Use the standardized solution to titrate the acid of unknown concentration.
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How NaOH is standarized Add known mass of potassium phthalate Potassium acid phthalate is a primary standard Add a/b indicator (phenolphthalein) Fill up the burette with the NaOH solution (Concentration unknown) And then… Start titrating!
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How the unknown acid is titrated Add known volume of sample. Add water if necessary Add a/b indicator (phenolphthalein) Refill the burette with the standarized NaOH solution (Concentration is now known)
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What is an acid-base indicator? An acid-base indicator is a weak acid or weak base itself. The protonated form has a different color than the unprotonated form. The color change happens over a pH range. (8.0-9.8 for phenolphthalein).
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