C Composition of Soda Ash Since Na 2 CO 3 reacts first the volume of the first

C composition of soda ash since na 2 co 3 reacts

This preview shows page 2 - 3 out of 3 pages.

C. %Composition of Soda Ash Since Na 2 CO 3 reacts first, the volume of the first titration can be related to the concentration of Na 2 CO 3 . The moles of of H + from HCl is equal the moles of CO 3 2- . [HCl] 1st titration = [Na 2 CO 3 ] total The volume of the second titration can be related to NaHCO 3 . [HCl] 2nd titration = [NaHCO 3 ] total However, some of the NaHCO 3 comes from the Na 2 CO 3 . The additional NaHCO 3 is an impurity. [NaHCO 3 ] total - [Na 2 CO 3 ] total = [NaHCO 3 ] from impurities Therefore g Na 2 CO 3 total x100% = % g Na 2 CO 3 g NaHCO 3 total The following summarizes important data:
Image of page 2

Subscribe to view the full document.

Table 2: Summary of Significant Data %Na 2 CO 3 trial 1 8.47% trial 2 15.64% trail 3 13.41% mean 12.51% range 7.71% standard deviation 3.67% RSD (ppt) 293.6ppt confidence limit (95%) fro m 4.25 % to 20.76 % CONCLUSION While gravimetric methods can be used to measure moisture content, it is not precise. Many external factors come into play as the sample is constantly being exposed to the air. It absorbs moisture as it is moved in and out of the dessicator. Magnetic weight balances while accurate, are prone to mistaken calibration and positioning. REFERENCES [1] Kolthoff I. M. Textbook of Quantitative Inorganic Analysis, 1 st Ed., Minneapolis. 1947 [2] Skoog D.A.; West D.M.; Holler F.J.; Crouch S.R.; Show C.C.; Introduction to Analytical Chemistry, 8th ed.; Cengage Learning Asia Pte Ltd, Pasig 2012 pp 124-186 [3] Howard Triebold, Quantitative analysis with applications to agricultural and food products.
Image of page 3
  • Fall '17
  • Sir Jaden Smith

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes