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1. How many grams of Ca (OH)2 do you need to prepare a 250 mL of 0.2M solution. Calculate mol wt. of Ca(OH)2 using the following information. Atomic mass of Ca- 40 0-16 H-1 (note there are 2 O and 2 H in 1 molecule of Ca(OH)2

1. How many grams of Ca (OH)2 do you need to prepare a 250 mL of 0.2M solution. Calculate mol wt. of Ca(OH)2 using the following information. Atomic mass of Ca- 40 0-16 H-1 (note there are 2 O and 2 H in 1 molecule of Ca(OH)2

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**Calculating the Mass of Ca(OH)2 Needed for Solution Preparation** **Problem Statement:** 1. How many grams of Ca(OH)2 do you need to prepare a 250 mL of 0.2M solution? Calculate the molar mass of Ca(OH)2 using the following information. Atomic mass of: - Ca: 40 - O: 16 - H: 1 *Note: There are 2 O and 2 H atoms in one molecule of Ca(OH)2.* --- **Solution:** 1. **Calculate the molar mass of Ca(OH)2:** The molecular formula of Calcium Hydroxide is Ca(OH)2. To find its molar mass, we sum up the atomic masses of all the atoms in the formula. - Atomic mass of Ca: 40 - Atomic mass of O: 16 (since there are 2 O atoms, 16 * 2 = 32) - Atomic mass of H: 1 (since there are 2 H atoms, 1 * 2 = 2) Therefore, the molar mass of Ca(OH)2 = 40 (Ca) + 32 (O) + 2 (H) = 74 g/mol 2. **Determine the number of moles needed:** The problem asks to prepare 250 mL (0.25 L) of a 0.2 M solution. Molarity (M) is defined as the number of moles of solute per liter of solution. Number of moles = Molarity (M) * Volume (L) \( \text{Number of moles} = 0.2 \, \text{M} * 0.25 \, \text{L} = 0.05 \, \text{moles} \) 3. **Calculate the mass of Ca(OH)2 required:** The mass of a substance can be found by multiplying the number of moles by the molar mass. Mass = Number of moles * Molar mass \( \text{Mass} = 0.05 \, \text{moles} * 74 \, \text{g/mol} = 3.7 \, \text{g} \) Therefore, to prepare a 250 m
Transcribed Image Text:**Calculating the Mass of Ca(OH)2 Needed for Solution Preparation** **Problem Statement:** 1. How many grams of Ca(OH)2 do you need to prepare a 250 mL of 0.2M solution? Calculate the molar mass of Ca(OH)2 using the following information. Atomic mass of: - Ca: 40 - O: 16 - H: 1 *Note: There are 2 O and 2 H atoms in one molecule of Ca(OH)2.* --- **Solution:** 1. **Calculate the molar mass of Ca(OH)2:** The molecular formula of Calcium Hydroxide is Ca(OH)2. To find its molar mass, we sum up the atomic masses of all the atoms in the formula. - Atomic mass of Ca: 40 - Atomic mass of O: 16 (since there are 2 O atoms, 16 * 2 = 32) - Atomic mass of H: 1 (since there are 2 H atoms, 1 * 2 = 2) Therefore, the molar mass of Ca(OH)2 = 40 (Ca) + 32 (O) + 2 (H) = 74 g/mol 2. **Determine the number of moles needed:** The problem asks to prepare 250 mL (0.25 L) of a 0.2 M solution. Molarity (M) is defined as the number of moles of solute per liter of solution. Number of moles = Molarity (M) * Volume (L) \( \text{Number of moles} = 0.2 \, \text{M} * 0.25 \, \text{L} = 0.05 \, \text{moles} \) 3. **Calculate the mass of Ca(OH)2 required:** The mass of a substance can be found by multiplying the number of moles by the molar mass. Mass = Number of moles * Molar mass \( \text{Mass} = 0.05 \, \text{moles} * 74 \, \text{g/mol} = 3.7 \, \text{g} \) Therefore, to prepare a 250 m
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