What is the molar concentration of calcium hydroxide that has 0.185g solute in 100ml solution?
A saturated solution of calcium hydroxide contains 0.185g per 100 ml of solution.
Calculate the molarity of the saturated calcium hydroxide solution
M = moles/L soln.
moles Ca(OH)2 = grams/molar mass = ??
M = ??moles/0.1L = ??
1.85g/0.1L
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To find the molar concentration of calcium hydroxide, we need to know the molar mass of calcium hydroxide and perform a few calculations.
First, let's determine the molar mass of calcium hydroxide (Ca(OH)2):
- Calcium (Ca) has an atomic mass of 40.08 g/mol.
- Oxygen (O) has an atomic mass of 16.00 g/mol.
- Hydrogen (H) has an atomic mass of 1.01 g/mol.
Calculating the molar mass of calcium hydroxide:
Molar Mass = (1 × Ca) + (2 × O) + (2 × H)
Molar Mass = (1 × 40.08 g/mol) + (2 × 16.00 g/mol) + (2 × 1.01 g/mol)
Molar Mass = 40.08 g/mol + 32.00 g/mol + 2.02 g/mol
Molar Mass = 74.10 g/mol
Now that we know the molar mass of calcium hydroxide, we can calculate the number of moles of calcium hydroxide in the given 0.185 g of solute:
Number of Moles = Mass / Molar Mass
Number of Moles = 0.185 g / 74.10 g/mol
Number of Moles ≈ 0.0025 mol
The molar concentration is given by the formula:
Molar Concentration = Number of Moles / Volume of Solution
The volume of the solution is given as 100 mL, but it is better to convert it to liters:
Volume of Solution = 100 mL = 100/1000 L = 0.1 L
Now, let's calculate the molar concentration:
Molar Concentration = 0.0025 mol / 0.1 L
Molar Concentration = 0.025 mol/L
Therefore, the molar concentration of the calcium hydroxide solution is approximately 0.025 mol/L.