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(ii) between 0 and 100.0 mL NaOH added

H2A
H2O
HA -
Na+
A2-
OH -

(iii) 100.0 mL NaOH added
H2A
H2O
HA -
Na+
A2-
OH -

(iv) between 100.0 mL and 200.0 mL NaOH added
H2A
H2O
HA -
Na+
A2-
OH -

(v) 200.0 mL NaOH added
H2A
H2O
HA -
Na+
A2-
OH -

(vi) after 200.0 mL NaOH added
H2A
H2O
HA -
Na+
A2-
OH-

5 answers

Sorry, I forgot the question. For the following volumes of NaOH added, list the major species present after the OH - reacts completely.

I feel like I'm always missing something. For example, I thought (ii) was H2A HA- OH - and H2O,but it was wrong
This can't be answered without a concn of NaOH.
The [NaOH] was never given in the question. Only the total mL.
I think ii is H2A, HA^-, H2O, Na^+.
Dr. Bob, you are amazing.I was completely stuck. Thank you so much!