Question

Histidine is one twenty natural amino acids and it possesses three acidic protons (pKa1 = 1.82, pKa2 = 6.00, pKa3 = 9.17). a) Starting with 10.0 mL of 0.325 M histidine, determine the pH (two decimal places) of this solution (Hint: the first pKa is the main contributor of hydronium concentration). b) Using 0.100 M NaOH as a titrant, at what volumes are the 1st, 2nd, and 3rd equivalence points reached (two decimal places)? 1st Veq = mL 2nd Veq = mL 3rd Veq = mL c) What are the pH values at the 1st, 2nd, and 3rd mid-equivalence points (two decimal points)? 1st pH1/2eq = 2nd pH1/2eq = 3rd pH1/2eq = d) What are the pH values at the 1st and 2nd equivalence points? 1st pHeq = 2nd pHeq = e) What is the pH at the third equivalence point? 3rd pHeq =

          Histidine is one twenty natural amino acids and it possesses three acidic protons (pKa1 = 1.82, pKa2 = 6.00, pKa3 = 9.17).
a) Starting with 10.0 mL of 0.325 M histidine, determine the pH (two decimal places) of this solution (Hint: the first pKa is the main contributor of hydronium concentration).
b) Using 0.100 M NaOH as a titrant, at what volumes are the 1st, 2nd, and 3rd equivalence points reached (two decimal places)?
1st Veq = mL
2nd Veq = mL
3rd Veq = mL
c) What are the pH values at the 1st, 2nd, and 3rd mid-equivalence points (two decimal points)?
1st pH1/2eq =
2nd pH1/2eq =
3rd pH1/2eq =
d) What are the pH values at the 1st and 2nd equivalence points?
1st pHeq =
2nd pHeq =
e) What is the pH at the third equivalence point?
3rd pHeq =

Histidine is one twenty natural amino acids and it possesses three acidic protons (pKa1 = 1.82, pKa2 = 6.00, pKa3 = 9.17).
a) Starting with 10.0 mL of 0.325 M histidine, determine the pH (two decimal places) of this solution (Hint: the first pKa is the main contributor of hydronium concentration).
b) Using 0.100 M NaOH as a titrant, at what volumes are the 1st, 2nd, and 3rd equivalence points reached (two decimal places)?
1st Veq = mL
2nd Veq = mL
3rd Veq = mL
c) What are the pH values at the 1st, 2nd, and 3rd mid-equivalence points (two decimal points)?
1st pH1/2eq =
2nd pH1/2eq =
3rd pH1/2eq =
d) What are the pH values at the 1st and 2nd equivalence points?
1st pHeq =
2nd pHeq =
e) What is the pH at the third equivalence point?
3rd pHeq =

Added by Jesse G.

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