Question

This is for the titration of H3A (a hypothetical triproitic acid) by NaOH. H3A concentration: 0.0400M, NaOH concentration: 0.480M

H3A: Ka1=4.0*10^(-3), Ka2=6.3*10^(-6), Ka3=7.9*10^(-9)

(A) Determine the chemical species that would be most abundant at each

*Before titration

*At first half-equivalence point

*At first equivalence point

*At second half-equivalence point

*At second equivalence point

*At third half-equivalence point

*At third equivalence point

(B) Determine how many moles of NaOH are needed for step

*First half-equivalence point

*First equivalence point

*Second half-equivalence point

*Second equivalence point

*Third half-equivalence point

*Third equivalence point

(C) Determine pH at each step

*Before titration

*At first half-equivalence point

*At first equivalence point

*At second half-equivalence point

*At second equivalence point

*At third half-equivalence point

*At third equivalence point

*3.00 mL past third equivalence point

Please remember significant figures

Answer 1