How would you prepare 500mL of 6.0M NaOH solution using solid NaOH pallets?
I assume you mean pellets.
How many mols do you want? That's mols = M x L = ?
Then mols = grams/molar mass. You know mols and molar mass, solve for grams.
By the way, we prefer you use the same screen name. You get answers faster that way and we can keep up with things better. Using different names does NOT help; i.e., we don't mind one student asking several questions.
To prepare a 500mL 6.0M NaOH solution using solid NaOH pellets, you'll need to follow these steps:
1. Determine the molar mass of NaOH: Sodium (Na) has an atomic mass of 22.99 g/mol, Oxygen (O) has an atomic mass of 16.00 g/mol, and Hydrogen (H) has an atomic mass of 1.01 g/mol. So the molar mass of NaOH is calculated as follows:
Na = 22.99 g/mol
O = 16.00 g/mol
H = 1.01 g/mol
NaOH = Na + O + H = 22.99 + 16.00 + 1.01 = 40.00 g/mol
2. Calculate the amount of solid NaOH required: The desired molarity is 6.0M, which means there are 6.0 moles of NaOH in 1 liter (or 1000 mL) of solution. Since we want to prepare a 500mL solution, we'll need half of the moles. So the calculation is as follows:
Moles of NaOH required = Molarity * Volume (in liters)
= 6.0 mol/L * 0.5 L
= 3.0 mol
Mass of NaOH required = Moles * Molar mass of NaOH
= 3.0 mol * 40.00 g/mol
= 120.00 g
3. Weigh the solid NaOH: Using a balance or scale, measure and weigh out 120.00 grams of solid NaOH pellets. It's important to handle NaOH with caution as it is caustic and can cause burns. Wear appropriate protective clothing and use proper lab equipment.
4. Dissolve NaOH in water: Fill a clean and dry beaker or container with about half of the required volume of water, which is 250mL in this case. Slowly add the solid NaOH pellets to the water while stirring continuously to promote dissolution. NaOH is highly exothermic when dissolved, so it's important to add the solid to the liquid and not the other way around to prevent splashing and heat buildup.
5. Dilute to the final volume: Once the NaOH is completely dissolved, add more water to reach the final volume of 500mL while continuing to stir.
Note: It's important to keep in mind that NaOH is highly caustic and can cause severe burns. Always use caution and wear proper protective equipment when handling it. Additionally, be sure to label the solution appropriately and store it in a proper container for future use.