Calculate the concentration of a standard solution of hydrated oxalic acid (H2C2O4·2H2O) prepared by dissolving 25.21g of hydrated oxalic acid in 250.0mL of deionised water.



To calculate the concentration of the standard solution of hydrated oxalic acid (H₂C₂O₄·2H₂O), we can follow these steps:

1. **Calculate the molar mass of hydrated oxalic acid (H₂C₂O₄·2H₂O):**

   - H₂C₂O₄: 
     - Hydrogen (H): 2 atoms × 1.01 g/mol = 2.02 g/mol
     - Carbon (C): 2 atoms × 12.01 g/mol = 24.02 g/mol
     - Oxygen (O): 4 atoms × 16.00 g/mol = 64.00 g/mol
     - Total for H₂C₂O₄: 2.02 + 24.02 + 64.00 = 90.04 g/mol
   - 2H₂O (Water of crystallization): 
     - Hydrogen (H): 4 atoms × 1.01 g/mol = 4.04 g/mol
     - Oxygen (O): 2 atoms × 16.00 g/mol = 32.00 g/mol
     - Total for 2H₂O: 4.04 + 32.00 = 36.04 g/mol
   - **Molar mass of H₂C₂O₄·2H₂O** = 90.04 g/mol + 36.04 g/mol = **126.08 g/mol**

2. **Calculate the number of moles of hydrated oxalic acid:**

   \[
   \text{Number of moles} = \frac{\text{Mass}}{\text{Molar Mass}} = \frac{25.21 \text{ g}}{126.08 \text{ g/mol}} \approx 0.2000 \text{ mol}
   \]

3. **Calculate the concentration of the solution:**

   The concentration \( C \) in mol/L is given by:

   \[
   C = \frac{\text{Number of moles}}{\text{Volume of solution in liters}}
   \]

   The volume of the solution is 250.0 mL, which is equivalent to 0.2500 L.

   \[
   C = \frac{0.2000 \text{ mol}}{0.2500 \text{ L}} = 0.8000 \text{ mol/L}
   \]

So, the concentration of the hydrated oxalic acid solution is **0.8000 mol/L**.

Would you like more details or have any questions?

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Here are 8 related questions:

1. How does the molar mass of anhydrous oxalic acid (H₂C₂O₄) compare to the hydrated form?
2. What is the role of water of crystallization in hydrated compounds?
3. How would the concentration change if the volume of water used was different?
4. How can we prepare a diluted solution from this concentrated oxalic acid solution?
5. How do you determine the purity of oxalic acid in a laboratory setting?
6. What are the typical uses of oxalic acid in chemical analysis?
7. How does temperature affect the solubility and concentration of oxalic acid in water?
8. How can oxalic acid be standardized using titration methods?

**Tip:** Always ensure accurate measurement of both mass and volume when preparing standard solutions to obtain precise concentrations.

Learn how to calculate the concentration of a standard solution of hydrated oxalic acid (H₂C₂O₄·2H₂O) by following detailed steps. Includes molar mass calculation and concentration formula application. Suitable for college-level chemistry students.

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