Start Virtual ChemLab and select Creating a Solution
Question # 00119839
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Updated on: 10/18/2015 11:55 AM Due on: 11/17/2015
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 and 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
63
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 © 2006 by Pearson Education, Inc.
Reactions and Stoichiometry
Calculate the molarity of the NaHCO3 solution in units of mol/L.
ISBN 1-269-57297-0
64
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 © 2006 by Pearson Education, Inc
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 and 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
63
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 © 2006 by Pearson Education, Inc.
Reactions and Stoichiometry
Calculate the molarity of the NaHCO3 solution in units of mol/L.
ISBN 1-269-57297-0
64
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 © 2006 by Pearson Education, Inc
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Solution: Start Virtual ChemLab and select Creating a Solution