you need to make a 3.5 Molar solution of Ca(OH)2, however, you only want to make 50ml of this Ca(OH)2 solution. How many grams of Ca(OH)2 will you need to weigh out and add to 50ml of water?
Mass=VolumeinLiters*Molarity*Molmass
To calculate the mass of Ca(OH)2 required to make a 3.5 Molar solution in 50ml of water, we'll follow these steps:
Step 1: Convert the volume from milliliters to liters.
To do this, divide 50ml by 1000 to get the volume in liters.
50ml ÷ 1000 = 0.05 liters
Step 2: Determine the molar mass of Ca(OH)2.
The molar mass of Ca(OH)2 is calculated by adding up the atomic masses of its constituent atoms.
- Calcium (Ca) atomic mass = 40.08 g/mol
- Oxygen (O) atomic mass = 16.00 g/mol
- Hydrogen (H) atomic mass = 1.01 g/mol
Thus, the molar mass of Ca(OH)2 = (40.08 + 2*(1.01) + 16.00) g/mol = 74.09 g/mol
Step 3: Apply the formula to calculate the mass of Ca(OH)2.
Mass (in grams) = Volume (in liters) * Molarity * Molar mass
Mass = 0.05 liters * 3.5 M * 74.09 g/mol
Mass = 0.175 g * 74.09 g/mol
Mass ≈ 12.96 g
Therefore, you will need to weigh out approximately 12.96 grams of Ca(OH)2 to add to 50ml of water in order to make a 3.5 Molar solution.