Hey there! My professor wrote this vague problem on the board and I can't figure out...

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Chemistry

Hey there! My professor wrote this vague problem on the boardand I can't figure out how to solve it so --- I apologize inadvance for any lack of clarity.
50.0 mL of 0.03M of Cysteine is titrated by 0.06M of NaOH
pKa 2= 8.37
pKa 1 = 1.92
What is the pH of the solution.....
1) Before any titrant is added
2) 12.5 mL of NaOH
3) 25.0 mL of NaOH
4) 37.5 mL of NaOH
5) 50.0 mL of NaOH
6) 60.0 mL of NaOH
I really want to understand this type of problem for exams inthe future so any explanation to go along with your work would besuper appreciated. Thank you!!

Answer & Explanation Solved by verified expert

3.8 Ratings (397 Votes)

cysteine proton dissociation depends on the acidity ofthe proton that which is most acidic lower pKa will dissociatefirst Consequently the H on the COOH group pKa1will dissociate before that on the NH3 grouppKa2i have shown here general dissociatio of animo acidnow we move t questioni cystine is neutral in nature so pH before addition will be7 See Answer

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