Post Lab 4 - CHM 3120C Analytical Chemistry Sec 001 Post...

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CHM 3120C Analytical Chemistry Sec 001 Post Lab Lab 4: Volumetric Determination of Impure Sodium Carbonate Problem: In this experiment we will use the technique of volumetric determination using a standardized solution of HCl to titrate a solution of sodium carbonate known as “soda ash”. While knowing the amount of ash that is titrated and the volume of the standardized solution of HCl used, the amount of total carbonate will be determined in the sample. This experiment will also include the use of two different indicators that will provide different color changes. Therefore, for this experiment to be successful, observation of these colors will help to have the real endpoint. If titration is done incorrect and if it is passed to appear to a different color, one has gone beyond the endpoint and repetition of the experiment can occur. Hypothesis: The hypothesis for this experiment is that at least 25% of the total amount of sodium carbonate will be determined in the sample. This percentage is because of the changes of color that will occur during the experiment. Since two different indicators will be added, the titration level of difficulty will increase therefore, a small amount of the percentage found of sodium carbonate is predicted. Since there were three different samples that were weighed out in different amount as well this will change the amount of HCL used. The color changes will probably will be not exactly how stated in the procedures, therefore one may pass the endpoint without even noticing.

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