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 will follow these steps: Step 1: Determine the chemical formula and calculate the molar mass of Calcium hydroxide. The chemical formula for calcium hydroxide is 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 2: Calculate the number of moles of Ca(OH)_2. Mass of Ca(OH)_2 = 2.50 g Number of moles (n) = MassMolar mass n = 2.50 g74 g mol^-1 n ≈ 0.03378378 mol Step 3: 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 4: Calculate the concentration of the solution. Concentration (C) = Number of molesVolume C = 0.03378378 mol0.500 dm^3 C ≈ 0.06756756 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.