Data Table Total mass NaHCO3 2.0427 g weight I got from the lab Moles NaHCO3 0.0243 mole L of solution 0.05 L Molarity of solution 0.4864 M Calculate the Molarity of your sodium bicarbonate solution. Using the molarity of the sodium bicarbonate solution you made, calculate the following: 1. If the density of the resulting solution is 1.047 g/mL, calculate the total mass of the solution. 2. Since you know the mass of the sodium bicarbonate you put in, calculate the mass of water in the solution. 3. Calculate the mass percent of sodium bicarbonate in the solution. 4. Calculate the mole fraction of sodium bicarbonate in the solution.
1. Now you will mass out a sample of the sodium bicarbonate. You will need to open the bottle by pointing at the lid and it will say Remove Lid. Next, grab the scoop and drag it to the open mouth of the bottle. Then, as you move the scoop down the label of the bottle, it will fill up to different amounts. Select the largest amount and drag the scoop to the weigh paper in the balance and let the sample go. This should be approximately 1 gram of sample on the balance. Add a second scoop to the weigh paper so that you have approximately 2 grams of sodium bicarbonate total. Be sure to record the total mass, to the correct significant figures. You will find a data table in this procedure. Drag the weigh paper and your sample to the beaker and release the sample. It is now in the beaker and you are ready to proceed. Click the green Zoom Out arrow
2. Now it is time to make your solution. Generally, chemists would use a volumetric flask for this, but that is not available in this simulation. So, we will be using the 50mL graduated cylinder. Drag the beaker with your sodium bicarbonate to the 50 mL graduated cylinder near the sink. Hold the beaker over the top of the cylinder and allow the sample to be added to it. Now it is time to fill the cylinder. Hold the cylinder under the tap in the sink until it fills with water to make an aqueous solution. When the cylinder is full, it will automatically snap back into place.
3. You have just made an aqueous solution of sodium bicarbonate. Now to determine its concentration, you need to figure out what the total volume is. We will assume that this graduated cylinder is divided into 1 mL increments. This means that we can estimate the volume to 0.1 mL to determine significant figures. Include this volume in your data table.
4. Calculate the molarity of your solution using the formula:
5. To clean up the lab, click on the red container to the right of the bench.
Data Table
| Total mass NaHCO3 | 2.0427 g weight I got from the lab |
| Moles NaHCO3 | 0.0243 mole |
| L of solution | 0.05 L |
| Molarity of solution | 0.4864 M |
Calculate the Molarity of your sodium bicarbonate solution.
Using the molarity of the sodium bicarbonate solution you made, calculate the following:
1. If the density of the resulting solution is 1.047 g/mL, calculate the total mass of the solution.
2. Since you know the mass of the sodium bicarbonate you put in, calculate the mass of water in the solution.
3. Calculate the mass percent of sodium bicarbonate in the solution.
4. Calculate the mole fraction of sodium bicarbonate in the solution.
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