Question 1.
Correct option is (E)
7. Choose the best answer for an aqueous solution labeled "0.10 M sodium hydroxide," A) the...
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 0.10 M aqueous solutions gives the highest pH? A) CH3COOH (pKa = 4.75) B) HF (PK:= 3.45) C) H3PO4 (pKal = 2.12) D) HCIQ (Ka=2.00) E) Since all are acids, the pH is the same for all solutions. 5. Which one of the following salts gives an acidic aqueous solution? A) CsNO3 B) CaCl2C ) LiF D) Cr(CIO4)3 E) NaCH3CO2 6. 7. All of the following are strong acids except A) HCIQB) HC104 C) HI D)...
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–
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
If a buffer were needed with a pH of 7.0, what would be the best combination of weak acid and conjugate base to formulate the buffer? (please explain why you chose your answer) A) H3PO4 and H2PO4- B) H2PO4- and HPO42- C) HPO42- and PO43- D) acetic acid and acetate E) lactic acid and lactate
An aqueous solution of 0.100 M phosphoric acid (12.0 mL) is titrated with 0.400 M KOH as shown below. phosphoric acid has three pKas: 2.148, 7.198, 12.375. H3PO4(aq) + OH-(aq) H2PO4-(aq) + H2O(l) H2PO4-(aq) + OH-(aq) HPO42-(aq) + H2O(l) HPO42-(aq) + OH-(aq) PO43-(aq) + H2O(l) Calculate the pH of phosphoric acid solution before any KOH has been added. We were unable to transcribe this imageWe were unable to transcribe this imageWe were unable to transcribe this image
11. which of the following pairs of species is a conjugate acid-base pair? a. NaF, F b. NHs, NH c. H30+, ОН- d. H2CO3, CO32 8. which of the following salts is most likely to form an aqueous solution having the pH <7? a. NaBr b. LiNO3 c. NH4CI d. RbCN 2. which of the following pairs of species is not a conjugate acid-base pair? a. OH, H b. HOCI, OCh c. HSO4,SO42 d. H2CO3, HCO3 11. which of the...
10. For an aqueous solution labeled "0.10 M potassium bromide," A) the pH is greater than 7. B) the pH = 13. D) the pH is less than 7. E) the pH = 7. C) the pH = 1. 11. For a 0.10 M solution of a weak acid, HA, with pKa = 6, which of the following is true? A) [HA] =[A-] B) [HA] does not equal [H3O+] C) [HA] =[H3O] D) [HA] = K E) [HA] = 0...
please help with this hw ?! Answer the Q. In the spaces below. Use the back of the page if necessary. 1. Give the conjugate bases for the following Bronsted-Lowry acids: a) H2SO4 b) HNO; c) H20 d) OH e) H3PO4 Ans. a). 2. Give the conjugate acids for the following Bronsted-Lowry bases: a) CO32- b) HPO42. c) H2PO4 d)NH2 e) NH3 Ans. a) b) 3. Calculate the pH of a 0.025 M solution of barium hydroxide. 4. Show how...
Plz answer 1. Calculate the concentration of H30" in a solution that contains 5.0 Identify the solution as acidic, basic, or neutral. A) 2.0x 10-5 M, basic D) 9.0x 10-1 M, acidic 10-10 M OH at 25°C B) 2.0 10-5 M, acidic E) 9.0 10-1 M. basic 2. Calculate the [H3O~] concentration in an aqueous solution with a pH of 9.85 at 25 C c)5.0x 10-10 M, neutral A) 7.1x 10-5 M B) 4.2x 10-10 M C)8.7 10-10 M E)...