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To calculate the molecular weight of the amino acid (alanine or glycine) based on titration data, more specific information is typically needed, such as the concentration of the titrant (HCl in this case), the exact titration point (pKa or equivalence point), and whether you are titrating to fully protonate or deprotonate the amino acid.

However, given the titration data shown in the table, I can help outline the general steps for calculating the molecular weight:

### Steps to calculate the molecular weight:
1. **Determine the equivalence point**: 
   - From the titration data, the equivalence point can be identified where there is a rapid change in pH. This occurs around 10-15 mL of HCl in the titration of alanine (or similarly in glycine).

2. **Moles of HCl used**:
   - Use the formula: 
     \[
     \text{Moles of HCl} = \text{Molarity of HCl} \times \text{Volume of HCl at equivalence point}
     \]
     You need the concentration of HCl for this calculation.

3. **Moles of Alanine or Glycine**:
   - At the equivalence point, the moles of HCl used are equal to the moles of alanine or glycine because it's a 1:1 reaction between the amino acid and the HCl.

4. **Calculate molecular weight**:
   - Once the moles of amino acid are known, divide the mass of the sample by the number of moles to find the molecular weight.
     \[
     \text{Molecular weight} = \frac{\text{Mass of sample}}{\text{Moles of amino acid}}
     \]

If you have additional details like the molarity of HCl or the sample mass, we can perform the actual calculation. Would you like to clarify these details or provide more data?

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### Related Questions:
1. What is the molarity of the HCl solution used in this titration?
2. How can you determine the equivalence point more precisely from the titration curve?
3. How do alanine and glycine differ in their titration behavior based on the data?
4. What role does the isoelectric point (pI) play in amino acid titration curves?
5. How would changing the concentration of HCl affect the titration results?

### Tip:
Make sure the pH electrode is properly calibrated before starting titration experiments for accurate results.

Learn how to calculate the molecular weight of amino acids like alanine and glycine using titration data. This method involves finding the equivalence point and using stoichiometric calculations based on the moles of HCl and the mass of the sample.

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