You want to make up a 0,100 mol.dm cube sodium carbonate solution.You have a 200ml volumetric flask and a bottle of sodium carbonate decahydrate (Na2CO3-10H2O)
To make a 0.1 mol.dm^-3 sodium carbonate solution using a 200 ml volumetric flask and sodium carbonate decahydrate (Na2CO3-10H2O), you will need to calculate the amount of sodium carbonate decahydrate required.
1. Determine the molar mass of sodium carbonate decahydrate:
Molar mass of Na2CO3 = 2(22.99) + 12.01 + 3(16.00) = 105.99 g/mol
Molar mass of H2O = 2(1.01) + 16.00 = 18.02 g/mol
Molar mass of Na2CO3-10H2O = 105.99 + 10(18.02) = 286.17 g/mol
2. Calculate the mass of sodium carbonate decahydrate required:
0.1 mol.dm^-3 means that for every 1 dm^3 (1000 ml) of solution, you need 0.1 mol of sodium carbonate.
Mass (g) of sodium carbonate decahydrate = molar mass x number of moles
= 286.17 g/mol x 0.1 mol
= 28.617 g
3. Measure 28.617 grams of sodium carbonate decahydrate using a balance.
4. Transfer the measured sodium carbonate decahydrate into a clean, empty 200 ml volumetric flask.
5. Add distilled water to the flask until it is around two-thirds full.
6. Swirl the flask gently to dissolve the sodium carbonate decahydrate completely.
7. Once dissolved, carefully fill the flask up to the mark on the neck with distilled water.
8. Accurately mix the solution by inverting the flask multiple times.
Now, you have successfully prepared a 0.1 mol.dm^-3 sodium carbonate solution in a 200 ml volumetric flask using sodium carbonate decahydrate.
Hey Bot--You have a problem here. You didn't factor in making only 200 mL of solution.
You're right, I apologize for the oversight. Let's recalculate the amount of sodium carbonate decahydrate to make a 0.1 mol.dm^-3 sodium carbonate solution with a 200 ml volumetric flask.
1. Determine the molar mass of sodium carbonate decahydrate:
The molar mass of Na2CO3-10H2O is still calculated as before, which is 286.17 g/mol.
2. Calculate the required mass of sodium carbonate decahydrate for a 200 ml solution:
We want to make a 0.1 mol.dm^-3 solution, which means that for a 200 ml solution, we need 0.1 mol of sodium carbonate.
0.1 mol Na2CO3 / 1 dm^3 x 0.2 dm^3 = 0.02 mol Na2CO3
Mass (g) of sodium carbonate decahydrate = molar mass x number of moles
= 286.17 g/mol x 0.02 mol
= 5.7234 g
3. Measure 5.7234 grams of sodium carbonate decahydrate using a balance.
4. Transfer the measured sodium carbonate decahydrate into a clean, empty 200 ml volumetric flask.
5. Add distilled water to the flask until it is around two-thirds full.
6. Swirl the flask gently to dissolve the sodium carbonate decahydrate completely.
7. Once dissolved, carefully fill the flask up to the mark on the neck with distilled water.
8. Accurately mix the solution by inverting the flask multiple times.
Apologies again for the previous error, and I hope this clarifies the correct procedure for preparing a 0.1 mol.dm^-3 sodium carbonate solution in a 200 ml volumetric flask.
To make a 0.100 mol/dm³ sodium carbonate solution using a 200 mL volumetric flask and sodium carbonate decahydrate (Na2CO3-10H2O), you need to follow these steps:
Step 1: Calculate the molar mass of Na2CO3-10H2O.
The molar mass of Na2CO3 = 2(22.99 g/mol) + 12.01 g/mol + 3(16.00 g/mol) = 105.99 g/mol
The molar mass of H2O = 2(1.01 g/mol) + 16.00 g/mol = 18.02 g/mol
The molar mass of Na2CO3-10H2O = (105.99 g/mol) + 10(18.02 g/mol) = 286.18 g/mol
Step 2: Calculate the mass of sodium carbonate decahydrate required.
Given that you want a 0.100 mol/dm³ solution, the number of moles of Na2CO3-10H2O required is:
0.100 mol/dm³ × 0.200 dm³ = 0.020 moles
The mass required can be calculated based on the molar mass:
Mass = Number of moles × Molar mass
Mass = 0.020 moles × 286.18 g/mol = 5.72 grams (rounded to three significant figures)
Step 3: Dissolve the calculated mass of Na2CO3-10H2O in distilled water.
Add 5.72 grams of sodium carbonate decahydrate to a container and dissolve it in a small amount of distilled water.
Step 4: Transfer the solution to the 200 mL volumetric flask.
Use a funnel when transferring the solution to avoid any spills. Rinse the container with small amounts of distilled water to ensure all sodium carbonate has been transferred.
Step 5: Fill the volumetric flask to the mark with distilled water.
Slowly add distilled water to the flask to reach the 200 mL mark. Use a dropper or pipette to add the last few drops of water to reach the mark.
Step 6: Mix the solution well.
Gently invert the flask a few times to ensure the solution is thoroughly mixed.
Now you have made a 0.100 mol/dm³ sodium carbonate solution in a 200 mL volumetric flask using sodium carbonate decahydrate.