CHM211 Lab #5.docx - Prof Skinner Chem Lab 211 11 Oct 2018...

This preview shows page 1 out of 1 page.

Prof. Skinner Chem Lab 211 11, Oct. 2018 Post-lab questions 1. When a larger amount of the antacid was used, more NaOH should have been used as well. We observed this in our lab results and the largest antacid that was used with .406 grams had the most NaOH with 35.29mL. 2. If less acid was used, less base would be used as well. HCl is the acid and NaOH is the base, and they have a 1:1 ratio, so if there is less of one, then there is less of the other. 3. The solution must be boiled prior to titration to allow all of the antacid tablet to dissolve in the HCl solution. 4. I do not understand how to calculate the number of grams in the antacid tablet, which is required to find the percent error. I do understand how to compute percent error though. If for example my result for the first titration was .103g of Ca(HNO3)2 were in the .206g, then the percentage error would be 10.7%. Since the manufacturer stated that 3.41g of antacid contains 1.916g of Ca(HNO3)2, then the theoretical value would be .56, and my laboratory value would be .50. When plugged into the equation, the answer would be

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture