Q12 :
HCN is weakest acid among given acids, that means it's conjugate base would be most basic .
Answer: (c) CN-
Q13:
HCl > HF , HNO2 < HNO3 and HClO4 > HClO2 is the acidic strength of acids .
Stronger bases are F-, NO2- and ClO2-
Answer: (c)
Q14 :
NH4Cl solution is acidic in nature .
Answer: (b) pH of the solution decreases
Q15:
A buffer has maximum capacity when pH = pKa
Answer: (a) propionic acid
12. Consider the acid dissociation constants () shown below. Which of the following is the strongest...
Phosphoric acid, H3PO4, is a triprotic acid with the following acid dissociation constants: Ka1 = 7.5 × 10-3 Ka2 = 6.2 × 10-8 Ka3 = 4.2 × 10-13 Which of the following combinations would be best for preparing a pH 7 buffer? a. H3PO4 and NaH2PO4 b. H3PO4 and HCl c. Na2HPO4 and Na3PO4 d. NaH2PO4 and Na2HPO4 e. H3PO4 and Na3PO4
Phosphoric acid has three protons that can ionize. The Kas are as follows: Ka1 = 6.9 x 10-3 Ka2 = 6.4 x 10-8 Ka3 = 4.8 x 10-11 Which of these constants would you use to calculate the pH of a 0.1 M solution of H3PO4? A. Ka1, Ka2, and Ka3 B. Ka1, and Ka2 C. Ka1 only D. Ka2, and Ka3 E. Ka1, and Ka3
Phosphoric acid has the following dissociation constants: Ka1 = 7.5×10-3; Ka2 = 6.2×10-8; and Ka3 =4.8×10-13, how to prepare a buffer solution of pH 7.40?
2) The acid-dissociation constants of phosphoric acid (H3PO4) are Kaj = = 7.5 x 10-3 Ka2 = 6.2 x 10-8, and Kaz = 4.2 x 10-13 at 25.0°C. What is the pH of a 2.00 M aqueous solution of phosphoric acid?
A diprotic acid, H,A, has acid dissociation constants of Ka1 = 2.09 x 104 and Ka2 = 3.96 x 10-11. Calculate the pH and molar concentrations of H,A, HA-, and A2- at equilibrium for each of the solutions. A 0.183 M solution of H,A pH H,A= A2-1 HA] = A 0.183 M solution of N2HA. HA pH= HA A2- A 0.183 M solution of Na, A H,A ] pH= HA A2-1 M M
A diprotic acid, H,A, has acid dissociation...
25) The acid-dissociation constants of phosphoric acid (H2PO4) are KZ1 = 7.5 x 10-3, K22= 6.2 x 10-8, and K 3 = 4.2 x 10-13 at 25.0°C. What is the pH of a 2.00 M aqueous solution of phosphoric acid? 26) Zº is a weak base. An 0.350 M aqueous solution of NaZ is prepared. The pH of the solution was 8.93 at 25.0°C. The Ky of Zº is:
11. Which Brønsted-Lowry base has the strongest conjugate acid? A) CH.COM B) CN- C) F- D) NOZ E) CIO 12. Which Brønsted-Lowry acid has the strongest conjugate base? A) HBr B) HCIOC) HFD) HI E) HNO3 13. Calculate the H30+ concentration in an aqueous solution that contains 2.50 x 104 M in OH-. A) 4.00 x 10-'M B) 4.00 10-10M C) 4.00 10-11 M. D) 5.00 10-11 M E) None of these 14) What is the pH of a 0.020...
Consider the following data on some weak acids and weak bases acid base name formula name formula hydrocyanic acid HCN 4.9 x 10 10 NH31.8 x 10 ammonia hypochlorous acid HCIO 3.0x 10pyridine CHN 1.7x109 Use this data to rank the following solutions in order of increasing pH. In other words, select a the solution that will have the next lowest pH, and so on next to the solution that will have the lowest pH, a '2' next to solution...
A diprotic acid, H2A, has acid dissociation constants of
Ka1=1.01×10−4 and Ka2=4.08×10−12. Calculate the pH and molar
concentrations of H2A, HA−, and A2−at equilibrium for each of the
solutions.
A diprotic acid, H, A, has acid dissociation constants of Kal = 1.01 x 104 and K22 = 4.08 x 10-12. Calculate the pH and molar concentrations of H, A, HA, and A? at equilibrium for each of the solutions. A 0.176 M solution of H, A. pH= pH = 1...
Which of the following represents the usual relationship of acid-ionization constants for a tripprotic acid? a) Ka1 << Ka2 << Ka3 b) Ka1 ≥ Ka2 ≥ Ka3 c) Ka1 ≤ Ka2 ≤ Ka3 d) Ka1 >> Ka2 ≅ Ka3 e) Ka1 >> Ka2 >> Ka3