1. Using your titration results, determine the remaining concentration of HCl in your 25 ml aliquot

2. Determine the number of miles of HCl that were neutralized by the TUMS tablet.

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75 mL Osmg your weighing bottle, accurately weigh by difference your TUMS antacid tablet and place it in an appropriately labeled 250 mL Erlenmever flask. Accurately (i.e, use a volumetric pipet) add 190 ml of the standardized HCI (*0.15 M) to the flask Swirl the mixture to dissolve some of the tablet. (Record the EXPERIMENTAL concentration of the HCI in your lab note book) Continue to swirl the mixture until most of the tablet dissolves. Note that tablet has insoluble binder materials so you may not be able to get everything to completely dissolve. Heat the solution to a gentle boil and continue boiling for approximately 5 minutes to remove dissolved CO2 (what is the source of the Co2?). Use the wash bottle to wash down any film, which may be adhering to the inner walls of the flask during heating. Add 3-4 drops of phenolphthalein indicator. If the solution turns pink, add an additional 25.0 mL aliquot (make sure note how much acid you added) of the standardized HCl and boil again. Once you have confirmed that your solution is acidic (i.e. does not turn pink after phenol), remove the flask from the heat and set it aside on the lab bench to cool (please note that due to the presence of binder materials in the tablet, some material will not dissolve). Once the solution has cooled enough that it can be handled, quantitatively transfer the contents to a 250 mL Volumetric flask and dilute to the mark with distilled water. Accurately transfer a 25 ml aliquot of this solution to a 125 ml Erlenmeyer flask. Add 3-4 drops of the phenolphthalein indicator and titrate your sample using the standardized Sodium Hydroxide solution (again record the concentration into your notebook). Students will perform a total of 3 trials. 75 mL Osmg your weighing bottle, accurately weigh by difference your TUMS antacid tablet and place it in an appropriately labeled 250 mL Erlenmever flask. Accurately (i.e, use a volumetric pipet) add 190 ml of the standardized HCI (*0.15 M) to the flask Swirl the mixture to dissolve some of the tablet. (Record the EXPERIMENTAL concentration of the HCI in your lab note book) Continue to swirl the mixture until most of the tablet dissolves. Note that tablet has insoluble binder materials so you may not be able to get everything to completely dissolve. Heat the solution to a gentle boil and continue boiling for approximately 5 minutes to remove dissolved CO2 (what is the source of the Co2?). Use the wash bottle to wash down any film, which may be adhering to the inner walls of the flask during heating. Add 3-4 drops of phenolphthalein indicator. If the solution turns pink, add an additional 25.0 mL aliquot (make sure note how much acid you added) of the standardized HCl and boil again. Once you have confirmed that your solution is acidic (i.e. does not turn pink after phenol), remove the flask from the heat and set it aside on the lab bench to cool (please note that due to the presence of binder materials in the tablet, some material will not dissolve). Once the solution has cooled enough that it can be handled, quantitatively transfer the contents to a 250 mL Volumetric flask and dilute to the mark with distilled water. Accurately transfer a 25 ml aliquot of this solution to a 125 ml Erlenmeyer flask. Add 3-4 drops of the phenolphthalein indicator and titrate your sample using the standardized Sodium Hydroxide solution (again record the concentration into your notebook). Students will perform a total of 3 trials.

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Given the average titration volume of NaOH 263 mL The conc of NaOH solution 0 1282 M The volume of a... View the full answer