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.
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)
3 answers
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.
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.
1 answer