How do I make a 6M NaOH solution? (25mL)
and is there a certain way to make NaCl saturated? or is it already saturated?
For molarity, remember the definition.
Molarity - # mols/L
# mols = grams/molar mass.
equation 1.
M=mols/L
6M = mols/0.025 L
mols = 6M x 0.025 L = ?? That is the # mols you need.
equation 2.
mols = g/molar mass
?? from above = g/molar mass.
Plug in molar mass NaOH and solve for grams. Dissolve that many grams in some water. After it is dissolved, make the final volume to 25 mL.
For NaCl, it is quite soluble. The way to make it is to dissolve NaCl until no more will dissolve. Then it is saturated. To help determine how much NaCl that is, you can look up the solubility of NaCl. That will give you an idea how much to weigh if you know the volume.
To make a 6M NaOH (sodium hydroxide) solution, you will need to calculate the amount of NaOH needed based on its molar mass and the desired volume of the solution.
1. Determine the molar mass of NaOH:
- The atomic mass of sodium (Na) is 22.99 g/mol.
- The atomic mass of oxygen (O) is 16.00 g/mol.
- The atomic mass of hydrogen (H) is 1.01 g/mol.
- Adding them up, the molar mass of NaOH is 22.99 + 16.00 + 1.01 = 40.00 g/mol.
2. Calculate the amount of NaOH needed for a 6M solution:
- Molarity (M) is defined as the number of moles of solute in one liter of solution. Therefore, for a 6M solution, we need 6 moles of NaOH in one liter.
- Since we want to make a 25mL (0.025L) solution, we can use the following formula: moles = Molarity × volume (in liters).
- In this case, moles = 6M × 0.025L = 0.15 moles of NaOH.
3. Convert moles to grams:
- To convert moles to grams, multiply the number of moles by the molar mass of NaOH that you calculated earlier:
grams = moles × molar mass
grams = 0.15 moles × 40.00 g/mol = 6.00 grams of NaOH.
So, to make a 6M NaOH solution with a volume of 25mL, you would need to dissolve 6 grams of NaOH in enough water to reach a final volume of 25mL.
Regarding your second question about NaCl (sodium chloride), it can be dissolved in water to make a saturated solution. A saturated solution is one in which no more solute (in this case, NaCl) can dissolve at a given temperature, resulting in an equilibrium between the dissolved and solid forms. To prepare a saturated solution of NaCl, you would add NaCl to water in gradually increasing amounts while stirring until no more NaCl can dissolve and some solid NaCl remains undissolved at the bottom.
To make a 6M NaOH solution with a volume of 25mL, you will need the following steps:
Step 1: Calculate the amount of NaOH needed.
To determine the amount of NaOH required, use the formula:
Moles of NaOH = Molarity (M) x Volume (L)
Moles of NaOH = 6M x 0.025L (25mL = 0.025L)
Moles of NaOH = 0.15 mol
Step 2: Convert moles to grams.
The molar mass of NaOH is approximately 40g/mol.
Mass of NaOH = Moles x Molar mass
Mass of NaOH = 0.15mol x 40g/mol
Mass of NaOH = 6g
Step 3: Dissolve NaOH in water.
Add 6 grams of NaOH to a container, then slowly add distilled water while stirring until the total volume reaches 25mL.
Note: Always remember to be cautious when using NaOH as it is a strong base. Ensure to wear appropriate protective gear such as gloves and goggles.
Now, regarding your second question, NaCl (sodium chloride) is not already saturated by default. To make a saturated NaCl solution, you can follow these steps:
Step 1: Add a known amount of NaCl to a container.
Step 2: Slowly add distilled water to the container while stirring until no more NaCl can dissolve.
Step 3: Continue adding small amounts of NaCl while stirring until any additional NaCl does not dissolve. This indicates that the solution is saturated.
Step 4: Allow the solution to sit for a few hours to ensure it is fully saturated.
Note: The solubility of NaCl in water changes with temperature. Higher temperatures allow for more NaCl to dissolve.