3.21 g of calcium carbonate is dissolved into 250.0 mL of water to make a homogenous solution. What is the concentration os this solution?
To find the concentration of the solution, we need to calculate the amount of solute (calcium carbonate) dissolved in a given volume of solvent (water).
The concentration of a solution is typically expressed in moles per liter (mol/L) or molarity (M).
Given:
Mass of calcium carbonate = 3.21 g
Volume of water = 250.0 mL = 0.250 L
First, we need to convert the mass of calcium carbonate to moles. To do this, we divide the mass by the molar mass of calcium carbonate (CaCO3).
Molar mass of CaCO3 = (40.08 g/mol for Ca) + (12.01 g/mol for C) + (3 * 16.00 g/mol for O)
= 100.09 g/mol
Number of moles of CaCO3 = Mass of CaCO3 / Molar mass of CaCO3
= 3.21 g / 100.09 g/mol
= 0.0321 mol
Next, we calculate the concentration using the formula:
Concentration (C) = Amount of Solute (in moles) / Volume of Solution (in liters)
Concentration = 0.0321 mol / 0.250 L
= 0.1284 mol/L or 0.1284 M
Therefore, the concentration of the calcium carbonate solution is 0.1284 M.
mol CaCO3 = grams/molar mass
M = mols/L soln.
By the way, CaCO3 is not soluble in water.