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Stoichiometry Lab

Stoichiometry Lab. Analysis and Calculation. Stoich . Lab Introduction Part I. You must incorporate in FULL SENTENCE FORM the following: We have TWO purposes. Determine the amount of precipitate produced in grams. Determine the concentration of the sodium carbonate . Additional Topics:

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Stoichiometry Lab

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  1. Stoichiometry Lab Analysis and Calculation

  2. Stoich. Lab Introduction Part I • You must incorporate in FULL SENTENCE FORM the following: • We have TWO purposes. • Determine the amount of precipitate produced in grams. • Determine the concentration of the sodium carbonate. • Additional Topics: • Describe the differences between quantitative and qualitative data. Which are we using in this laboratory and why? • Describe volumetric and gravimetric analysis, give general examples we used in the laboratory. • Explain the filtration apparatus general purpose and its’ set-up.

  3. Stoich. Lab Introduction Part II • More Topics which MUST be discussed: • Discuss the molarity formula: give the formula, brief description of the variables, and the purpose of molarity. • Explain what are the purposes of molar coefficients (the molar ratio). • (WRITE THIS SENTENCE LAST)  Briefly in one sentence, describe specific experiment.

  4. Materials List & Procedures • MATERIALS: • In your materials, list those ONLY USED IN LAB. • Draw the Filtration Apparatus AFTER the list of materials with appropriate labels. • PROCEDURES: • Simply summarize all procedures as appropriate.

  5. Data Table • Your Data Table MUST include: • Na2CO3 mL used • CaCl2 mL used • Weight of filter paper alone • Weight of [filter paper + precipitate] • Weight of precipitate alone

  6. The Data Analysis of Stoich. Lab • There are five parts to the Data Analysis section. You MUST include a heading for each part. After the heading, you will show the appropriate work. • Identify the solid white precipitate (What compound did we produce in lab?) • Obtain the final weight of the white precipitate (How much does it weigh & first purpose of lab) • Convert to moles of the sodium carbonate(with moles of sodium carbonate can determine the concentration) • Calculate the molarity of the sodium carbonate(The second purpose of the lab) • Determine the percent Error for the Molarity (How accurately did you perform the experiment?)

  7. Part 1: Identify the white precipitate • What is the predicted precipitate according to Solubility Rules? Basic Eq: CaCl2(aq) + Na2CO3(aq) CaCO3(s) + 2NaCl(aq) The precipitate will be, calcium carbonate. Ionic Eq: MUST be in laboratory report Net Ionic Eq: MUST be in laboratory report

  8. Part 2 & 3of Data Analysis Section • Part 2: The weight of the precipitate. [filter paper + precipitate] – filter paper = precipitate (grams) • Part 3 : The moles of sodium carbonate Use the Basic Eq: CaCl2(aq) + Na2CO3(aq) CaCO3(s) + 2NaCl(aq) g CaCO3 x 1 mol CaCO3x 1 mol Na2CO3 = moles Na2CO3 100.08g CaCO3 1 mol CaCO3 1 mol of CaCO3 = 100.08 g CaCO3 1 mol CaCO3 = 1 mol Na2CO3 Conversion Keys:

  9. Part 4: Molarity of the sodium carbonate • To determine the molarity of the solution, we use: M = mol of solute = mol of moles Na2CO3 L of solution L of solution • Add the used Na2CO3 solution in mL, then convert to Liters • Apply liters of sodium carbonate and mol of sodium carbonate back into the molarity formula:

  10. Part 5: Percent Error • Once determining the experimental Molarity of Na2CO3, compare to expected value. • Percent Error = 100 x Your Result – Accepted Value Accepted Value

  11. Review - Road Map for Stoich. Lab Survival

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