Describe how to prepare 1 L of a 0.5 M solution of cobalt chloride hexahydrate (CoCl2 6H2O). Be sure to identify the labware shown above (flask and a scale), explain your reasoning, and show any calculations.
M = mols/L
You want 1 L of 0.5M so you want 1 x 0.5 = 0.5 mols.
grams for 0.5 mol = mols x molar mass = ?
Weigh that many grams CoCl2.6H2O, add to a 1 L volumetric flask, add some water, swirl to dissolve the solute, add DI water to the mark on the flask, mix thoroughly, stopper.
Ah, preparing a solution can be quite a molecular mix-up! Now, to get jiggy with cobalt chloride hexahydrate, here's how you can clownsolutely whip up a 1 L, 0.5 M solution!
1. First things first, we need to find out how much CoCl2 · 6H2O we need. The molar mass of CoCl2 · 6H2O is approximately 237.93 g/mol. And since we're aiming for a 0.5 M solution, we know that we need 0.5 moles of CoCl2 · 6H2O in 1 L of solution.
2. Now, you've got two friends to help you with this magical solution-making show: a flask and a scale. The flask will hold the final solution, and the scale will help measure the required amount of CoCl2 · 6H2O.
3. Place the flask on the scale and make sure it's tared. Tared means it's blank, , and ready for measurements – just like a clown without makeup.
4. Now, let's do a little math dance to figure out how much CoCl2 · 6H2O you need to weigh. Remember, we want 0.5 moles of CoCl2 · 6H2O. To convert moles to grams, simply multiply the number of moles by the molar mass. So, 0.5 moles x 237.93 g/mol = approximately 118.97 grams of CoCl2 · 6H2O.
5. Use the scale to measure out around 118.97 grams of CoCl2 · 6H2O. Don't worry if it's not exact – remember, clowns thrive on imprecision!
6. Once you've successfully measured the CoCl2 · 6H2O, carefully transfer it to the flask. You wouldn't want to make a comical mess, would you?
7. With CoCl2 · 6H2O safely in the flask, use a funnel to add enough water, with the volume approaching the 1 L mark. Make sure not to pour all those laughs at once; let the laughter flow gently like a playful river.
8. Finally, use a stirrer or some clown-approved mixing technique to thoroughly mix the contents of the flask. With a flick of the wrist, watch as cobalt chloride disappears into a watery wonderland.
Voila, you have it! One liter of a 0.5 M solution of cobalt chloride hexahydrate, all courtesy of your friendly neighborhood Clown Bot! Have a blast, my funny friend!
To prepare 1 L of a 0.5 M solution of cobalt chloride hexahydrate (CoCl2•6H2O), we will need to calculate the mass of the compound required and then dissolve it in water. Here's a step-by-step guide on how to do this:
1. Determine the molar mass of cobalt chloride hexahydrate (CoCl2•6H2O):
- The molar mass of CoCl2 = 58.933 g/mol
- The molar mass of 6H2O = (6 x 1.008 g/mol for hydrogen) + (6 x 16.00 g/mol for oxygen) = 108.00 g/mol
- The molar mass of CoCl2•6H2O = 58.933 g/mol + 108.00 g/mol = 166.933 g/mol
2. Calculate the mass of cobalt chloride hexahydrate required:
- Given that we want to prepare a 0.5 M solution, this means we need 0.5 moles of CoCl2•6H2O per liter of solution.
- Mass (g) = Molar mass (g/mol) x Moles
- Mass (g) = 166.933 g/mol x 0.5 mol = 83.4665 g
3. Obtain a flask with a suitable capacity:
- Since we are preparing 1 L of solution, it is ideal to use a 1 L volumetric flask. This flask is typically shaped like a narrow-necked bottle, specifically designed for accurately preparing a specific volume of solution.
4. Weigh out the required mass of cobalt chloride hexahydrate:
- Use a scale to accurately measure 83.4665 g of cobalt chloride hexahydrate. Ensure the flask is clean and dry before weighing to avoid contamination.
5. Transfer the solid into the flask:
- Carefully transfer the measured mass of cobalt chloride hexahydrate into the flask. Using a funnel can help in avoiding spills and mess.
6. Add distilled water to the flask:
- Slowly add distilled water into the flask until it reaches the calibration mark of 1 L on the neck of the volumetric flask. This will ensure a precise volume of 1 L.
7. Mix the solution:
- Tighten the flask cap or stopper and gently invert (flip upside down) the flask several times to ensure thorough mixing of the cobalt chloride hexahydrate with the water. Avoid vigorously shaking the flask to prevent splashing.
8. Label the solution:
- Clearly label the flask with the concentration (0.5 M) and contents (cobalt chloride hexahydrate) to avoid confusion.
And that's it! You have successfully prepared 1 L of a 0.5 M solution of cobalt chloride hexahydrate.
To prepare 1 L of a 0.5 M solution of cobalt chloride hexahydrate (CoCl2 · 6H2O), you will need to follow these steps:
1. Labware: The labware shown above includes a flask and a scale. The flask is used to mix the solution, and the scale is used to measure the required quantity of cobalt chloride hexahydrate.
2. Calculate the molar mass of cobalt chloride hexahydrate (CoCl2 · 6H2O).
- Molar mass of Co = 58.93 g/mol
- Molar mass of Cl2 = 35.45 g/mol × 2 = 70.90 g/mol
- Molar mass of H2O = (1.01 g/mol × 2) + (16.00 g/mol × 6) = 18.02 g/mol × 6 = 108.12 g/mol
Total molar mass = Molar mass of Co + Molar mass of Cl2 + Molar mass of H2O
Total molar mass = 58.93 g/mol + 70.90 g/mol + 108.12 g/mol
Total molar mass = 237.95 g/mol
3. Calculate the mass of cobalt chloride hexahydrate needed for a 0.5 M solution.
- Moles of CoCl2.6H2O = Molarity × Volume
- Moles of CoCl2.6H2O = 0.5 mol/L × 1 L
- Moles of CoCl2.6H2O = 0.5 mol
Mass of CoCl2.6H2O = Moles × Molar mass
Mass of CoCl2.6H2O = 0.5 mol × 237.95 g/mol
Mass of CoCl2.6H2O = 118.98 g
4. Weigh out 118.98 grams of cobalt chloride hexahydrate using the scale. Make sure the scale is tared (zeroed) before measuring.
5. Transfer the measured cobalt chloride hexahydrate to the flask. Use a funnel if necessary to avoid spillage.
6. Add approximately 800 mL of distilled water to the flask. Swirl the flask gently until the solid is dissolved completely.
7. Once the cobalt chloride hexahydrate is completely dissolved, add more distilled water to the flask until it reaches a total volume of 1 L.
8. Finally, mix the solution gently to ensure homogeneity.
You have now prepared a 0.5 M solution of cobalt chloride hexahydrate in a volumetric flask.