How do you determine the mass of NACL needed to prepare 25.00 ml of a 1.585M NaCl Solution?
25 ml = 0.025 L
.025L * 1.585 mole/L = 0.0396 mole * 93.9g/mole = 3.72g NaCl
You need to rethink the molar mass of NaCl. It's closer to 58.44 than to 93.9.
To determine the mass of NaCl needed to prepare a 1.585M solution in 25.00 ml, you need to follow these steps:
Step 1: Convert the given volume from milliliters (ml) to liters (L).
1 ml = 0.001 L
25.00 ml = 25.00 * 0.001 L = 0.025 L
Step 2: Use the formula for molarity to calculate the moles of NaCl needed.
Molarity (M) = moles of solute / liters of solution
Rearrange the formula to solve for moles:
moles of solute = Molarity * liters of solution
moles of solute = 1.585 M * 0.025 L = 0.039625 moles
Step 3: Calculate the molar mass of NaCl.
Since NaCl has one sodium (Na) atom and one chlorine (Cl) atom, you can determine the molar mass using the atomic masses of sodium and chlorine.
The atomic mass of sodium (Na) is 22.99 g/mol, and the atomic mass of chlorine (Cl) is 35.45 g/mol.
Molar mass of NaCl = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol
Step 4: Calculate the mass of NaCl using the moles and molar mass.
mass = moles * molar mass
mass = 0.039625 mol * 58.44 g/mol ≈ 2.3157 g
Therefore, you would need approximately 2.3157 grams of NaCl to prepare a 25.00 ml solution with a molarity of 1.585M.
To determine the mass of NaCl needed to prepare a given volume of a certain concentration NaCl solution, you need to follow these steps:
Step 1: Understand the given information.
In this case, the given information is:
- The volume of the solution to be prepared: 25.00 ml
- The concentration of the solution to be prepared: 1.585 M NaCl
Step 2: Determine the formula weight of NaCl.
NaCl is composed of one sodium atom (Na) with an atomic weight of 22.99 g/mol and one chlorine atom (Cl) with an atomic weight of 35.45 g/mol. Adding these two atomic weights together gives the formula weight of NaCl, which is 58.44 g/mol.
Step 3: Use the formula for molarity to convert the given concentration to moles.
Molarity (M) is defined as the number of moles of solute per liter of solution. To convert the given concentration (1.585 M) to moles, divide the concentration by the molar mass of NaCl:
1.585 moles/L ÷ 58.44 g/mol = 0.02713 moles
Step 4: Convert the given volume to liters.
The given volume is in milliliters (ml), so you need to convert it to liters by dividing by 1000:
25.00 ml ÷ 1000 = 0.025 liters
Step 5: Use the moles of NaCl and the volume in liters to calculate the mass of NaCl.
The relationship between moles, volume, and mass can be expressed using the formula:
mass = moles × molar mass
Substituting the values into the formula:
mass = 0.02713 moles × 58.44 g/mol = 1.585 grams (rounded to three decimal places)
Therefore, you would need 1.585 grams of NaCl to prepare 25.00 ml of a 1.585 M NaCl solution.