Acid/ Base Titrations Lab Report Lab: Acid/ Base Titrations (Choice I) CHEM 1411 P11 MW (7am – 9:50am) South Texas College Spring 2018 For: Dr. Subrata Mandal By: Sofia Resendez
Acid/Base Titrations Lab Report Objective An unknown acid, either a sample of vinegar or an acid salt, will be analyzed by the process of titration, using a standard sodium hydroxide solution. The sodium hydroxide solution to be used for the analysis will be prepared approximately and will then be standardized against a weighed sample of a known acidic salt. Materials Used Two burets and clamp Buret brush 5-mL pipet and safety bulb Soap 1-L glass or plastic bottle with stopper Sodium hydroxide pellets Primary standard grade potassium hydrogen phthalate (KHP) Phenolphthalein indicator solution Unknown vinegar or acid salt sample Electric scale Summary of Procedures Record all data and observations directly in your notebook in ink. A. Preparation of the Burets and Pipet Rinse the burets and the pipet with distilled water to see if they are clean. Partially fill with a few millimeters of soap solution and rotate the buret/ pipet so that all surfaces encounter the soap.
Acid/Base Titrations Lab Report Rinse with tap water, followed by several portions of distilled water. Before using a pipet/buret in the following procedures, rinse the pipet/buret with several small portions of the solution that is to be used in the pipet/buret. Discard the rinsing. B. Preparation of the sodium hydroxide solution Clean and rinse the 1-L bottle and stopper. Label the bottle “Approx. 0.1 M NaOH.” Put about 500 mL of distilled water into the bottle. Weigh out approximately 4g (0.1 mol) of sodium hydroxide pellets and transfer to the 1-L bottle. Stopper and shake the bottle to dissolve the sodium hydroxide. Add additional distilled water to the bottle until the water level is approximately 1 inch from the top. Stopper and shake thoroughly to mix. Keep the bottle tightly stoppered when not actually in use. Set up one of the burets in the buret clamp. Rinse and fill the buret with the sodium hydroxide solution just prepared. C. Standardization of the sodium hydroxide solution Clean and dry a small beaker. Take the beaker to the oven that contains the primary standard grade potassium hydrogen phthalate (KHP).
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- Spring '14
- Sodium hydroxide, KHP