Describe how you would prepare 250 ml of a 0.10M NaCl solution?
Molar mass of NaCl is 58.443 g mol^-1
so for 250 ml of a 0.10 M solution we need
250 x 0.1 x 58.443 g /1000 =1.461 g NaCl
The main steps are
weigh 1.461 g of NaCl into a clean dry (100 ml) beaker
add approximately 20 ml demineralised water and agitate until solid has dissolved.
transfer the solution to a clean 250 ml volumetric flask, you will need to rinse the beaker a number of times to ensure complete transfer
make the solution up to the mark with demineralised water
put in stopper and shake to ensure mixture is homogeneous.
These are the basic steps, btu I am sure you add more to 'describe' how you would do this.
1. How would you prepare 250 mL of 0.1 M NaOH? Calculate the mass of NaOH needed, and describe the procedure and glassware you would use.
To prepare a 0.10M NaCl solution with a volume of 250 mL, you will need to follow the steps below:
1. Calculate the mass of NaCl required using the formula:
Mass = Molarity x Volume x Molar mass
Molarity (M) = 0.10 M
Volume (V) = 250 mL = 0.250 L
Molar mass of NaCl = 58.44 g/mol
Mass = 0.10 M x 0.250 L x 58.44 g/mol
Mass = 1.460 g
2. Measure 1.460 g of NaCl on a balance. Make sure to use a weighing instrument that can measure accurately to three decimal places.
3. Transfer the measured NaCl into a clean and dry 250 mL volumetric flask using a funnel, if necessary. Ensure all the solid is transferred.
4. Add distilled water to the flask slowly and carefully until the volume mark on the neck of the flask is reached. Swirl gently to dissolve the NaCl completely.
5. After the NaCl is fully dissolved, seal the flask with a stopper or cap and invert it a few times to ensure uniformity.
6. Label the flask with the solution concentration, date of preparation, and any other relevant information.
Note: If you don't have a 250 mL volumetric flask, you can use a beaker and adjust the final volume by adding or removing distilled water until reaching the desired volume of 250 mL. In this case, make sure to stir the solution well to ensure uniformity.
To prepare a 0.10M NaCl solution, you will need the following steps:
1. Determine the molar mass of NaCl: The molar mass of NaCl is 58.44 g/mol. This means that one mole of NaCl weighs 58.44 grams.
2. Calculate the amount of NaCl needed: To prepare a 0.10M solution, you will need 0.10 moles of NaCl per liter. Since you want to prepare 250 ml (0.25 liters) of solution, you need to calculate the amount of NaCl needed. Use the equation:
Amount of NaCl (in moles) = Molarity (in moles per liter) × Volume (in liters)
Amount of NaCl = 0.10 mol/L × 0.25 L = 0.025 mol
3. Convert the amount of NaCl to grams: Multiply the amount of NaCl in moles by its molar mass to calculate the required mass. Use the equation:
Mass of NaCl (in grams) = Amount of NaCl (in moles) × Molar mass (in grams per mole)
Mass of NaCl = 0.025 mol × 58.44 g/mol ≈ 1.461 g
4. Weigh the required amount of NaCl: Use a balance to accurately measure 1.461 grams of NaCl.
5. Dissolve NaCl in water: Add the measured NaCl to a beaker and slowly dissolve it in distilled water. Stir gently until all the NaCl is dissolved.
6. Adjust the final volume: Add distilled water to the beaker and make sure the total volume is precisely 250 ml.
7. Mix the solution: Stir the solution thoroughly to ensure the NaCl is uniformly distributed.
Congratulations! You have prepared 250 ml of a 0.10M NaCl solution.