A certain triprotic acid (H3A) has pKa values of pKa1 = 2.0 and pKa2 = 5.0 and pKa3 = 9.0. What is the pKb of the intermediate H2A -?
A. 3.5
B. 5.0
C. 7.0
D. 9.0
E. 12.0
A certain triprotic acid (H3A) has pKa values of pKa1 = 2.0 and pKa2 = 5.0...
For a given triprotic acid H3A, which of its pKa values usually will be the largest? 1. pKa2 2. pKa3 3. pKa1 4. pKa4 5. Not enough information is given. 6. pKa0
A novel triprotic acid (3 carboxylic acids) has pKa1 = 3.0, pKa2 = 5.0, and pKa3 = 6.50. At pH = 4.0, what is the APPROXIMATE percentage of Acid(2H)- (loss of 1 proton) versus total amount of Acid in solution? a. 50% b. 80% c. 0% d. 25% e. 90%
For a given triprotic acid H3A, which of its pKa values usually will be the largest? 1. Not enough information is given. 2. pka4 3. pkal 4. pKao 5. pka3 6. pka2
Phosphoric acid is a triprotic acid with the following pKa values: pKa1=2.148 pKa2=7.198 pKa3=12.375 You wish to prepare 1.000 L of a 0.0100 M phosphate buffer at pH 7.580. To do this, you choose to mix the two salt forms involved in the second ionization, NaH2PO4 and Na2HPO4, in a 1.000 L volumetric flask and add water to the mark. What mass of each salt will you add to the mixture? Mass NaH2PO4=? Mass Na2HPO4=?
Using Pauling’s rules, calculate the pKa values (all) of following acids: (PKa1,Pka2 or pka3 if acid is polyprotic) H3PO4, H3PO3 and H3PO2
Arsenic acid is a triprotic acid with the following pKa values: pKa 1 = 2.240; pKa2 = 6.960; pKa3 = 11.500. You wish to prepare 1.000 L of a 0.0400 M aresenate buffer at pH 10.430. To do this, you choose to mix the two salt forms involved in the second ionization, Na3AsO4 and Na2HAsO4, in a 1.000 L volumetric flask and add water to the mark. What mass of each salt will you add to the mixture?
Arsenic acid is a triprotic acid with the pKa values pKal = 2.240, pKa2 = 6.960, and pKa3 = 11.500. You wish to prepare 1.000 L of a 0.0500 M arsenate buffer at pH 6.320. To do this, you choose to mix the two salt forms involved in the second ionization, NaH_AsO4 and Na HASO4, in a 1.000 L volumetric flask and add water to the mark. What mass of each salt will you add to the mixture? mass NaH_AsO4...
. Tricarballylic acid, H3T, has pKa1 = 2.9, pKa2 = 4.4 and pKa3 = 6.0. At pH 2.0, the principal species in solution is a. H3T b.H2T - c. HT2- d. T3 Please explain Thank you!!
Carbonic acid has the following pKa values: pKa1 = 6.4 and pKa2 = 10.2. Indicate which species are present at each of the following pH values: 6.4, 8, or 13
4. A diprotic acid has the following pK values: pKa1 = 5.50, pKa2 = 9.50 A. At what pH does [H2A] = [HA- ]? B. At what pH doe [HA- ] = [A2- ]? C. Which is the principal species at pH = 3.50, H2A, HA- , or A2- ? Justify your answer using the Henderson-Hasselbach equation. D. Which is the principal species at pH = 7.5, H2A, HA- , or A2- ? Justify your answer (don’t use Henderson-Hasselbach equation,...