Describe how to correctly prepare 400 mL of 0.6 M NaOH starting from solid NaOH.
You want how many moles? That's mols = M x L = 0.6 x 0.400 L = ?
How many grams is that? That's mols = grams/molar mass. You know molar mass and mols solve for grams NaOH.
Take that many grams of PURE solid NaOH, add the solid pellets to a 400 mL volumetric flask, add some water, swirl to dissolve, let cool, add distilled water to the mark on the flask, stopper, mix thoroughly, label.
NOTE: NaOH is not a primary standard as it comes out of the reagent bottle.It absorbs CO2 from the air and it's quick to do so. This is an OK answer if a freshman class but it isn't a good way for accurate work. If this is in advanced chemistry this is not an OK answer UNLESS you have PURE NaOH.
Well, first you need to put on your lab coat and safety goggles because things are about to get real serious. Now, grab that solid NaOH and a balance, and weigh out approximately 48 grams of it. Make sure to use precision, but don't worry, I won't judge if you accidentally spill some.
Next, grab a 400 mL volumetric flask and fill it up with some distilled water. It's important to use distilled water because tap water can be a bit... impure. Nobody wants impure solutions, right?
Once the flask is almost full, pour in that finely weighed NaOH powder. Be careful not to inhale the fumes, we don't want you turning into a cartoon character or anything.
Now, swirl the flask gently to dissolve the NaOH. You can even play some soothing elevator music if it helps. Keep swirling until all the solid has completely dissolved and you're left with a clear solution.
Finally, carefully fill up the volumetric flask to the 400 mL mark with more distilled water. And voila! You've just prepared 400 mL of a 0.6 M NaOH solution. Now go ahead and do a little victory dance. You deserve it!
To prepare 400 mL of 0.6 M NaOH from solid NaOH, follow these steps:
1. Determine the molar mass of NaOH. The molar mass of Na is 22.99 g/mol, O is 16.00 g/mol, and H is 1.01 g/mol. Therefore, the molar mass of NaOH is: 22.99 g/mol + 16.00 g/mol + 1.01 g/mol = 39.99 g/mol.
2. Calculate the amount of NaOH needed. Use the formula:
Mass = Molarity x Volume x Molar mass
Mass = 0.6 mol/L x 0.4 L x 39.99 g/mol
Mass = 9.5976 g
Therefore, you will need 9.5976 grams of NaOH.
3. Weigh out 9.5976 grams of solid NaOH using a balance.
4. Dissolve the NaOH in distilled water in a beaker. Start by adding some water to the beaker, and then add the NaOH slowly while stirring continuously. Be cautious as the reaction with water is exothermic, and it may cause the solution to heat up.
5. Continue stirring until all the NaOH has dissolved. It may take some time for the solid to completely dissolve, so be patient.
6. Once the NaOH is fully dissolved, transfer the solution to a volumetric flask using a funnel and glass rod. Rinse the beaker to ensure no NaOH is left behind.
7. Rinse the glass rod used for stirring with distilled water and add the rinsed water to the volumetric flask to ensure all the NaOH is transferred.
8. Finally, fill the volumetric flask up to the 400 mL mark with distilled water. Be sure to fill it up until the bottom of the meniscus (the curved line at the top of the liquid). This will give you a final volume of 400 mL.
9. Mix the solution gently to ensure the NaOH is thoroughly distributed throughout the solution.
You have now successfully prepared 400 mL of 0.6 M NaOH solution using solid NaOH. Remember to handle NaOH with care as it is caustic and can cause burns.
To correctly prepare 400 mL of a 0.6 M NaOH solution starting from solid NaOH, follow these steps:
1. Determine the molecular weight of NaOH: The molecular weight of NaOH is 22.99 grams per mole for sodium (Na) plus 16.00 grams per mole for oxygen (O) plus 1.01 grams per mole for hydrogen (H). Therefore, the molecular weight of NaOH is 39.99 grams per mole.
2. Calculate the amount of NaOH needed: To prepare a 0.6 M NaOH solution, you need to calculate the mass of NaOH required. The equation to calculate the mass is as follows:
Mass (g) = molarity (M) x volume (L) x molecular weight (g/mol)
Mass (g) = 0.6 mol/L x 0.4 L x 39.99 g/mol = 9.5988 grams
Therefore, you will need 9.5988 grams of solid NaOH.
3. Weigh out the NaOH: Use a balance or a weighing scale to accurately measure out 9.5988 grams of solid NaOH. Ensure that the balance is clean and calibrated before measuring.
4. Dissolve the NaOH in water: Add the measured NaOH to a beaker or flask containing about 300 mL of distilled water. Swirl the mixture gently to help dissolve the solid NaOH.
5. Transfer to a volumetric flask: Once the majority of the NaOH has dissolved, pour the solution into a 400 mL volumetric flask. Rinse the beaker or flask with a small amount of water to transfer any remaining NaOH into the volumetric flask.
6. Dilute with distilled water: Fill up the volumetric flask to the 400 mL mark with distilled water. Make sure to align the bottom of the meniscus with the calibration mark on the flask.
7. Mix well: Cap the flask and invert it several times to ensure thorough mixing of the solution.
Now, you have prepared a 400 mL of 0.6 M NaOH solution starting from solid NaOH. Be sure to label the container appropriately, indicating the concentration and date of preparation. It is also essential to handle NaOH safely, as it is a caustic substance. Wear appropriate protective equipment and follow proper safety protocols.