Titration Lab Write-up-2.pdf - Huong Le AP Chemistry Mr Macasaet Period 4,5 Titration Lab Write-up Date conducted September 15\/16 2016 I Purpose To

Titration Lab Write-up-2.pdf - Huong Le AP Chemistry Mr...

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Huong Le AP Chemistry Mr. Macasaet Period 4,5 Titration Lab Write-up Date conducted: September 15/16, 2016 I. Purpose: To determine experimentally the concentration of the stock solutions used to titrate the standardized solutions prepared II. Introduction: Titration is the slow addition of one solution of a known concentration (called a titrant) to a known volume of another solution of unknown concentration until the reaction reaches neutralization, which is often indicated by a color (chem.libretexts.org) Neutralization or neutralisation , is a chemical reaction in which an acid and a base react quantitatively with each other. In a reaction in water, neutralization results in there being no excess of hydrogen or hydroxide ions present in solution(wikipedia.com). In other words, the acid has neutralized the base and vice versa, making the new solution neutralized. The new solution then reaches equivalent point with no more acidic or basic characteristics. Excess in acid during neutralization reaction will turn phenolphthalein indicator to clear (the resulting solution is acidic) and excess in base during neutralization reaction will phenolphthalein indicator to faint pink(the resulting solution is basic), implicating that the neutralization reaction has passed equivalent point. In this experiment, using titration technique, we add standardized acid or base to neutralize the unknown acidic or basic solutions and determine the amount of acid or base needed for the
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neutralising reaction and the molarity of the unknown acid and base used. Upon passing equivalent point, the solution is expected to turn clear or colorless if the excess reagent is acid. Likewise, it is expected to turn faint pink if the excess reagent is base (Pearson: AP Chemistry Textbook,153) III. Materials: Solution: - Unknown acid R stock solution (titrand) - Unknown acid Q stock solution (titrand) - Unknown base X stock solution (titrand) - 0.1M NaOH standardized solution (titrant) - 0.1M HCl standardized solution (titrant) Other equipments: - Ring stand - 50 mL buret - Buret clamp - 250mL Erlenmeyer flasks (3) - 250mL beaker (2) - 500mL beaker (2) - 50mL graduated cylinder (1) - DI water - Phenolphthalein indicator IV. Procedure A. Titrating unknown stock solution of acid R/acid Q with standardized NaOH solution(0.1M) 1. The buret was cleaned three times with DI Water. 2. 50 mL of the standardized NaOH solution(titrant) was filled in the buret. Only for first trial : The buret was rinsed with a small amount of standardized NaOH before putting the rest of the solution in 3. The 250 mL beaker was filled with acid R/Q stock solution(titrand)
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4. 25 mL of acid R/Q stock solution was measured by 50 mL graduated cylinder and was poured in the 250 mL Erlenmeyer flask 5. 3 drops of phenolphthalein were added to the solution in the flask 6.
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  • Fall '15
  • Neethling,Melanie
  • Chemistry, ml, Sodium hydroxide

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