How to prepare 250 ml of 0.5M sodium chloride by dissolving solid salt NaCL?
You want how many mols? That's M x L = 0.5 x 0.250 = ?
Then grams NaCl = mols NaCl x molar mass NaCl.
The proper way to proceed is to weigh out the grams NaCl calculated above, transfer the solid quantitatively to a 250 mL volumetric flask, add some distilled or deionized water, swirl until the solid is dissolved, add water to the mark on the volumetric flask, stopper, mix thoroughly, label.
To prepare 250 ml of 0.5M sodium chloride solution by dissolving solid salt NaCl, you will need to follow these steps:
Step 1: Calculate the amount of NaCl needed.
To determine the amount of NaCl required, you can use the formula:
Molarity (M) = moles (mol) / Volume (L)
Rearranging the formula, we have:
moles (mol) = Molarity (M) x Volume (L)
Given:
Molarity (M) = 0.5M
Volume (L) = 0.250 L (since we want to prepare 250 ml, which is equal to 0.250 L)
Plugging these values into the formula:
moles (mol) = 0.5M x 0.250 L = 0.125 moles
Step 2: Calculate the mass of NaCl needed.
The molar mass of NaCl is 58.44 g/mol.
To find the mass, you can use the formula:
mass (g) = moles (mol) x molar mass (g/mol)
Plugging in the values:
mass (g) = 0.125 moles x 58.44 g/mol = 7.305 g
Step 3: Measure the mass of NaCl using a balance.
Using a balance, measure out 7.305 grams of NaCl accurately.
Step 4: Dissolve NaCl in water.
Pour the measured amount of NaCl into a 250 ml volumetric flask.
Add distilled water to the flask while swirling it gently until the dissolved solution reaches the 250 ml mark on the volumetric flask.
Step 5: Mix and ensure complete dissolution.
Carefully mix the solution by swirling the flask. Ensure that all the solid NaCl has dissolved completely. You now have a 0.5M sodium chloride solution with a volume of 250 ml.
Note: Always wear appropriate personal protective equipment (PPE) and follow safety precautions when handling chemicals.
To prepare a solution of 0.5M sodium chloride (NaCl) by dissolving solid salt, you will need to follow these steps:
1. Determine the amount of NaCl needed: The unit "0.5M" represents the molarity of the solution, which indicates the number of moles of solute (NaCl) per liter of solution. Since you want to prepare 250 ml (0.25 liters), you will need to calculate the number of moles of NaCl required. The formula to calculate moles is:
Moles = Molarity x Volume (in liters)
Therefore, the moles of NaCl needed will be:
Moles = 0.5M x 0.25 liters = 0.125 moles
2. Determine the molar mass of NaCl: The molar mass of a compound is the sum of the atomic masses of all the atoms in the compound. In this case, sodium (Na) has an atomic mass of 22.99 g/mol, and chlorine (Cl) has an atomic mass of 35.45 g/mol. Adding these together gives the molar mass of NaCl as:
Molar mass (NaCl) = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol
3. Calculate the mass of NaCl needed: Now that you know the number of moles needed and the molar mass of NaCl, you can calculate the mass of NaCl required. The formula to calculate mass is:
Mass = Moles x Molar mass
Therefore, the mass of NaCl needed will be:
Mass = 0.125 moles x 58.44 g/mol = 7.305 grams (approximately)
4. Measure the mass of NaCl: Using a weighing scale, measure out approximately 7.305 grams of NaCl.
5. Dissolve NaCl in water: Transfer the measured quantity of NaCl into a beaker or container. Add a small amount of distilled water (preferably deionized) to dissolve the NaCl. Stir gently until all the solid is dissolved.
6. Make up to the final volume: Once all the NaCl has dissolved, add distilled water to the container while stirring to bring the solution volume up to 250 ml. It's important to accurately measure the final volume to ensure that the solution is precisely 0.5M.
And there you have it! By following these steps, you can prepare 250 ml of 0.5M sodium chloride solution by dissolving solid NaCl.