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
Chemical Principles in the Laboratory
11th Edition
ISBN:9781305264434
Author:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Publisher:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Chapter24: The Standardization Of A Basic Solution And The Determination Of The Molar Mass Of An Acid
Section: Chapter Questions
Problem 1ASA
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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](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8a7d2ddc-7104-4036-9775-2f9910a0c3cf%2F013ed61b-c9d6-4bf0-ad12-3a74ade6a708%2F0pmponh_processed.jpeg&w=3840&q=75)
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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