Week 11: Converting Concentrations to Different UnitsOccasionally, when making solutions in the laboratory, it is convenient to make a solution with a certainconcentration unit, such as molarity, and then convert the concentration to a different unit. In thisassignment, you will make a sodium bicarbonate (baking soda) solution of a certain molarity and thenconvert that concentration to molality, mass percent, and mole fraction.1. Start Virtual ChemLab, select Reactions and Stoichiometry, and then select ConvertingConcentrations to Different Units from the list of assignments. The lab will open in the Titrationlaboratory.2. In the laboratory, a bottle of baking soda (sodium bicarbonate, NaHCO;) will be next to the balance,and an empty beaker will be on the stir plate. Drag the empty beaker to the spotlight next to thebalance, click in the Balance area to zoom in, place a weigh paper on the balance, and tare thebalance.3. Open the bottle by clicking on the lid (Remove Lid). Pick up the Scoop and scoop out some sample byfirst dragging the scoop to the mouth of the bottle and then pulling the scoop down the face of thebottle. As the scoop is dragged down the face of the bottle, it will pick up different quantities of solid.Select the largest sample possible and drag the scoop to the weighing paper on the balance until itsnaps in place and then let go. This will put approximately 1 g of sample on the balance. Repeat thisprocess six additional times so there is approximately 7.0 g of sample. Record the mass of theNAHCO; in the data table.4. Drag the weigh paper to the beaker and add the NaHCO; sample to the beaker. Click on the greenZoom Out arrow to return to the laboratory.5. Drag the beaker to the 50 mL graduated cylinder (the largest one) by the sink and empty the sampleinto the cylinder. Hold the cylinder under the tap until it fills with water to make an aqueous solutionof NAHCO;. (When the graduated cylinder is full, it will automatically snap back into place.) Notethat the solid is added and dissolved before the volume is measured when making a molar solution.Chemists normally use a volumetric flask for making molar solutions, but this is not available in thesimulation. Record the volume of the solution, in L, in the data table.6. Calculate the moles of NAHCO; in the sample and record the data in the data table.Data Tablemass NaHCO;moles NAHCO;liters NaHCO;7. The molarity is calculated using the formula:mass solute/moles solute/molar mass soluteI. solutionmolarity =I. solution 7. The molarity is calculated using the formula:moles solute mass solute/L solutionmolar mass soluteL solutionmolarity =Beyond Labz, all rights reservedCalculate the molarity of the NaHCO; solution in units of molL.8. If the density of the solution is 1.047 giml, calculate the molality of the solution in units of molkg.9. Calculate the mass percent of sodium bicarbonate in the solution.10. Calculate the mole fraction of sodium bicarbonate in the solution.

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6. Calculate the moles of NAHCO; in the sample and record the data in the data table. Data Table mass NaHCO; moles NaHCO; liters NaHCO; 7. The molarity is calculated using the formula: mass solute/ moles solute molarity = 1. solution molar mass solute I. solution

6. Calculate the moles of NAHCO; in the sample and record the data in the data table. Data Table mass NaHCO; moles NaHCO; liters NaHCO; 7. The molarity is calculated using the formula: mass solute/ moles solute molarity = 1. solution molar mass solute I. solution

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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