Which of the following species is present at the lowest concentration in an aqueous solution of H3PO4?
a) H2PO4- b) H3O+ c) H3PO4 d)| HPO42- e) PO43-
Which of the following species is present at the lowest concentration in an aqueous solution of...
6. Which of the following ions will be in the smallest concentration in a solution of H3PO4? H+ H2PO4- HPO42- PO43- 12. Which species is amphiprotic? Cl-(aq) PO43-(aq) CO32-(aq) HSO3-(aq)
Which of the following species are/is present at the highest concentration in a 1.0 mol/L aqueous HCN solution? a) CN- b) H3O+ c) HCN d) OH- e) a) and b) are present at the same concentration, which is greater than that of the other listed species.
7. Choose the best answer for an aqueous solution labeled "0.10 M sodium hydroxide," A) the pH is greater than 7 B) the pH is less than 7 C) the pH = 1 D) the pH = 7 E) the pH = 13 8. Which one of the following salts gives an acidic aqueous solution? A) LINO3 B) CsBr C) Col2 D) Mg(SO3)2 E) NaF 9. Which one of the following salts gives a basic aqueous solution? A) Fe(NO3)3 B)...
Which of the following equilibria represents the second ionization step of H3PO4? Group of answer choices HPO42-(aq) + H2O(aq) PO43-(aq) + H3O+(aq) H3PO4(aq) + 3H2O(l) PO43-(aq) + 3H3O+(aq) H2PO4-(aq) + H2O(l) HPO42-(aq) + H3O+(aq) H3PO4(aq) + 2H2O(l) HPO42-(aq) + 2H3O+(aq) H3PO4(aq) + H2O(l) H2PO4-(aq) + H3O+(aq)
Which of the following is not a conjugate acid-base pair? A H20 and H30+ B. H3PO4 and H2PO4 C. H3PO4 and HPO42- D. HPO42- and PO43 E. H2PO4 and HPO42-
Which of the following is a conjugate acid/ base pair? A) H3PO4, PO43- B) H2PO4 , PO43- C) HPO42-, PO43- D) H3PO4, HPO42-
18. Which of the following is the conjugate base of the dihydrogenphosphate ion, H2PO4-? A) H3PO4 B) NaH2PO4 C) OH- D) HPO42- E) PO43-
Phosphoric acid is a polyprotic acid (more than one proton that gets ionized) with 3 pK values: pK1=2.15, pK2=6.82 and pK3=12.38. Which molecular species are present at pH 6.82? mostly H3PO4 [H3PO4]=[H2PO4-] mostly [H2PO4-] [H2PO4-]=[HPO42-] mostly [HPO42-] [HPO42-]=[PO43-] mostly [PO43-] There is are no concentrations provided for the question so it is a question on what stage of deprotonation the phosphoric acid is at
Calculate the approximate pH of an aqueous solution of H2S , 0.05 M, and H3PO4, 0.21 M at 25°C. (Note: consider one decimal place for the pH answer.) pKa H2S/HS- = 7.02, pKa HS-/S2- = 13.99 pKaH3PO4/ H2PO4- =2.15, pKaH2PO4-/HPO42-=7.15, pKa HPO42-/ PO43- =12.38
ASAP! What is Ka for the weak acid, HA, if a 0.020 M solution of the acid has a pH of 3.29 at 25ºC? a. 5.1 × 10-2 b. 6.9 × 10-2 c. 2.6 × 10-4 d. 1.3 × 10-5 e. 1.0 × 10-6 What is the conjugate acid of H2PO4–(aq)? a. H3O+ b. H3PO4 c. HPO42– e. PO43–