Acetic Acid in Vineger

CHE 131 Spring 2008 Experiment 4 - Determination of acetic inflamed-hot in vinegar Preliminary Reading: Chang, 9th ed., section 4.7, pp. 150-153 Introduction: The brilliance component of vinegar (besides peeing) is acetic demigod, HC2H3O2, a weak venomous. In this experiment you will determine the concentration of acetic acid in a vinegar sample by titrating the acetic acid with the strong base sodium hydroxide, NaOH. The stoichiometry of the neutralization reaction is as follows: Molecular: Net Ionic: Neutralization: HC2H3O2(aq) + NaOH(aq) ? NaC2H3O2(aq) + water HC2H3O2(aq) + OH¯ (aq) ? C2H3O2+ (aq) + H2O H+(aq) + OH¯(aq) ? H2O(aq) (1) (2) (3) Definition: The end point (also bonk as the equivalence point) of a titration occurs when the initial takings of moles of H+ from the acid has been exactly neutralized by an equal flesh of moles of OH¯ ion from the sodium hydroxide: moles H+ = moles OH¯ (4) The only species present at the end point ar the products, sodium acetate and water. For reasons that are beyond the scope of the material covered so outside (but which will be covered in CHE 132), the solution is existing slightly basic at the end point of a weak acid-strong base titration. Consequently, an indicator must be elite which limitings food color when the solution changes from acidic to basic.

Either phenolphthalein (colorless in acid, red in base, also used as the diligent part in Ex-Lax?) or thymol game (yellow in acid, blue in base) may be used. Both indicators change color when the solution becomes very slightly basic Equipment: 25-mL pipette, 50-mL burette, 100-mL graduate cylinder, 3 250-mL Erlenmeyer flasks, three 1 50-mL or 250-mL beakers, burette funnel, 250! -mL volumetric flask, mute bottle, pipette bulb, eyedropper or Pasteur pipette with bulb, burette stand. You will be on the job(p) by yourself. Experimental: Obtain about 35 mL of vinegar in a clean, dry beaker and picture the credit or code number. This sample must be diluted before titration. Rinse a clean...If you want to accomplish a full essay, order it on our website: OrderEssay.net

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