This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
ScanSolve AI Answer
To find the concentration in mol dm^-3, we need to calculate the number of moles of calcium hydroxide and the volume of the solution in dm^3. Step 1: Determine the chemical formula of Calcium hydroxide. Calcium hydroxide is Ca(OH)_2. Step 2: Calculate the molar mass of Ca(OH)_2. Given atomic masses: Ca=40, O=16, H=1. Molar mass of Ca(OH)_2 = Ca + 2 × (O + H) = 40 + 2 × (16 + 1) = 40 + 2 × 17 = 40 + 34 = 74 g mol^-1 Step 3: Calculate the number of moles of Ca(OH)_2. Mass of Ca(OH)_2 = 2.50 g Number of moles (n) = Mass / Molar mass n = 2.50 g74 g mol^-1 n ≈ 0.03378 mol Step 4: Convert the volume of the solution from cm^3 to dm^3. Given volume = 500 cm^3 Since 1 dm^3 = 1000 cm^3: Volume (V) in dm^3 = 500 cm^31000 cm^3 dm^-3 V = 0.500 dm^3 Step 5: Calculate the concentration of the solution. Concentration (C) = Number of moles / Volume C = 0.03378 mol0.500 dm^3 C ≈ 0.06756 mol dm^-3 Rounding to three significant figures: C ≈ 0.0676 mol dm^-3 The concentration of the solution is 0.0676 mol dm^-3.