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Solutions of Known Molarity

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Solutions of Known Molarity;213: Creating a Solution of Known Molarity;In this assignment, you will weigh out a sample of baking soda (NaHCO3) and create a solution of known;molarity.;1. Start Virtual ChemLab, select Reactions and Stoichiometry, and then select Creating a;Solution of Known Molarity from the list of assignments. The lab will open in the Titration;laboratory.;2.;In the laboratory, a bottle of baking soda (sodium bicarbonate, NaHCO3) 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 the;balance, click in the Balance area to zoom in, place a weigh paper on the balance, and tare the;balance.;3.;Open the bottle by clicking on the lid (Remove Lid). Pick up the Scoop and scoop out some sample by;first dragging the scoop to the mouth of the bottle and then pulling the scoop down the face of the;bottle. As the scoop is dragged down the face of the bottle it will pickup different quantities of solid.;Select the largest sample possible and drag the scoop to the weighing paper on the balance until it;snaps in place and then let go. This will put approximately 1 g of sample on the balance. Repeat;with a second Scoop. Record the mass of the NaHCO3 in the data table.;4.;Drag the weigh paper to the beaker and add the NaHCO3 sample to the beaker. Click on the green;Zoom 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 sample;into the cylinder. Hold the cylinder under the tap until it fills with water to make an aqueous solution;of NaHCO3. (When the graduated cylinder is full it will automatically snap back into place.) Note that;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 the;simulation.;6.;Determine the liters of solution in the cylinder and record the data in the data table.;7.;Determine the moles of NaHCO3 in the sample and record the data in the data table.;Data Table;mass NaHCO3;moles NaHCO3;liters solution;ISBN 1-269-57297-0;8.;The molarity is calculated using the formula;molarity =;moles solute;=;L solution;mass solute;molar mass solute;L solution;67;Virtual ChemLab: General Chemistry, Student Lab Manual/Workbook, v4.5, Third Edition, by Brian F. Woodfield and Matthew C. Asplund. Published by Prentice Hall.;Copyright 2013 by Pearson Education, Inc.;Reactions and Stoichiometry;Calculate the molarity of the NaHCO3 solution in units of mol/L.;ISBN 1-269-57297-0;68;Virtual ChemLab: General Chemistry, Student Lab Manual/Workbook, v4.5, Third Edition, by Brian F. Woodfield and Matthew C. Asplund. Published by Prentice Hall.;Copyright 2013 by Pearson Education, Inc

 

Paper#16112 | Written in 18-Jul-2015

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