Acid Base Titration Lab Report

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Acid-Base Titration Lab Report By Andjela Mandic 11/24/14 Period 1 Purpose: The purpose of this experiment was to find the molarity of a sodium hydroxide (NaOH) solution by titrating it with a Hydrochloric Acid (HCl) solution. Materials: Burets (50mL), Buret Stand, Buret Clamp, Graduated Cylinder (10mL), Erlenmeyer Flask (125mL), Index Card, Beakers (250mL), Safety Goggles, Aprons, 0.100M HCl (standard solution), NaOH (concentration unknown), Distilled Water, Indicator (bromothymol blue) Procedure: 1. Using your graduated cylinder, pour 5.0mL of 0.10M HCl into your Erlenmeyer flask. 2. Add exactly 10.0mL of distilled water to your flask. 3. Add three drops of indicator to your flask using the dropper bottle.…show more content…
Every trial varied dramatically meaning that the results of the trials were not very reproducible. 2. The products of the reaction were salt (NaCl) and water (H2O), so it would be safe to dispose in the sink. 3. The balanced chemical equation for this titration is: NaOH+HCl→NaCl+H2O 4. Standard Solution - A solution that contains a known concentration of a substance. Titration - The process of determining the concentration of an unknown substance by adding a reagent until the substance undergoes a complete reaction. Endpoint - The color change of the indicator which signifies the completion of the titration. Volumetric Analysis - A method of determining the concentration of a substance in a solution by measuring volume. Gravimetric Analysis - A method used to find the quantitative data of a substance by measuring its weight. Equivalence Point - The point in a titration at which enough titrant is added to neutralize the solution being analyzed. Indicator - A substance that undergoes color change when the conditions in its solution change. 5. 6. Conclusion: Although the measurements were done inaccurately, the average molarity result for the experiment was very close to the actual molarity
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    Indicators An indicator is a substance which is used to determine the end point in a titration. In acid-base titrations, organic substances (weak acids or weak bases) are generally used as indicators. They change their colour within a certain pH range. The colour change and the pH range of some common indica­tors are tabulated below: Indicator pH Range Over Which Colour Change Occurs Colour of Acidi Form Colour of Base Form Methyl Orange 3.2-4.5 Orange Yellow Methyl Red 4.4 – 6.5 Red Yellow Bromothymol

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