The purpose should be two or three sentences stating why this lab was done, this should include but is not limiting to key concepts and techniques. Be sure to include multiple topics within the purpose, each lab covers more than one topic. The procedure section for this experiment should cite the lab manual and include a note with any changes made to the experiment during lab.

The following data table should be completed and presented in the data section.

Title

The mass before reaction and mass after reaction sections should have all been collected in your lab notebook and copied into your lab report. Be sure that you have the same number of significant figures given to you by the balance you used. To get the total mass for before the reaction you must do the following arithmetic:

Total Mass Before = (Mass of Half tablet) + (Mass of beaker and solution – Mass of beaker)

To get the total mass after you must do the following:

Total Mass After = (Mass of beaker and solution-Mass of Beaker) + (Mass of watch glass after – Mass of Watch glass before)

The CO₂ and NaHCO₃ sections can be calculated using your stoichiometry skills. First determine the correct balanced chemical equation from the background section. Write this equation in your data section above your data table. Next to determine the grams of CO₂ : subtract the total mass after the reaction from the total mass before the reaction. Once you have the grams of CO₂ convert the grams of CO₂ into moles of CO₂ using the molecular weight of CO₂. Then, using the molar ratio from the balanced chemical equation, find the moles of NaHCO₃. Report the grams of NaHCO₃ by converting the moles into grams using the molecular weight of NaHCO₃.

Finally determine the mass % of NaHCO₃ by using the following formula:

For the calculation section show one sample calculation for each calculation done to complete the data table. Make sure that this section is typed or written in ink. This section should also include the calculation for the percent error in the Mass % for each run. This can be determined by using the information provided in the background section regarding the known amount of NaHCO₃ in a tablet. Be sure that all of your units are the same before plugging them into the following equation:

Also include a graph using Excel of the Mass % of NaHCO₃ and mL of vinegar. The Mass % of NaHCO₃ goes on the y-axis and the volume of vinegar on the x-axis. Remember all graphing guidelines apply here. Use the graph to determine the total amount of NaHCO₃ in a tablet from where the graph begins to level out.

The conclusion sections should be several paragraphs in length and cover the following topics: a discussion of the trends in mass of CO₂, mass of NaHCO₃ and mass % found in your data table. Be sure to include values in your discussion. This section should also state the minimum volume of vinegar required to react all of the NaHCO₃ present in an Alka-Seltzer tablet. The minimum volume you pick should be supported and explained using your data. Be sure to state and explain the total amount of NaHCO₃ in an Alka-Seltzer tablet. A discussion of the % error in each run should be included as well as any errors in the experiment which may have led to the discrepancies in values.

Answer the following questions: