Homework Answers
Add Answer to:
Which of the following sets of chemicals can be used to prepare buffer solutions? For each...
Which of the following sets of chemicals can be used to prepare buffer solutions? For each...
Which of the following sets of chemicals can be used to prepare buffer solutions? For each one that can, identify the weak acid and its conjugate base. Include charge (if any) and phase. Enter "none" for both if a buffer is not possible. A.) Na2HPO4+HCl Is a buffer possible (Yes or No) and what is the weak acid and what is the conjugate base B.)NH4Cl+NH3 Is a buffer possible (Yes or No) and what is the weak acid and conjugate...
Lab 5 Buffers 1. Dissolved ions in salt solutions can act as acids or bases and...
Lab 5 Buffers 1. Dissolved ions in salt solutions can act as acids or bases and react with water to produce hydronium ions or hydroxide ions that contribute to the pH of the salt solution. Since strong acids and strong bases completely ionize in solution, the reverse reaction essentially does not occur, meaning that the resulting conjugate base of a strong acid or conjugate acid of a strong base do NOT act as acids or bases. Ions that are conjugate...
Question 5 1 pts A student mixes HCl and NaCl (source of conjugate) and claims to...
Question 5 1 pts A student mixes HCl and NaCl (source of conjugate) and claims to have made a buffer. Is this claim accurate? Yes- it is a mixture of acid and conjugate base after all Yes- any acid with a conjugate can make a buffer Oo oo C No-the conjugate base is so weak it does not reach equilibrium with water Need more information Question 6 1 pts Which combination of acid and base would create a buffer? Assume...
3.(16.3) Identify all the correct statements about an acid-base buffer solution. I. It can be prepared...
3.(16.3) Identify all the correct statements about an acid-base buffer solution. I. It can be prepared by combining a strong acid with a salt of its conjugate base. II. It can be prepared by combining a weak acid with a salt of its conjugate base. III. It can be prepared by combining a weak base with its conjugate acid. IV. The pH of a buffer solution does not change when the solution is diluted. V. A buffer solution resists changes...
Phosphate buffered saline (PBS) is a buffer solution commonly used in biological research. The buffer helps...
Phosphate buffered saline (PBS) is a buffer solution commonly used in biological research. The buffer helps to maintain a constant pH. The osmolality and ion concentrations of the solution usually match those of the human body. A) You need to prepare a stock solution at pH 7.00 with KH2PO4 and Na2HPO4 (pKa =7.21). What would be the respective concentration of these substances if you wish to obtain the final phosphate concentration [HPO4 −2 ] + [H2PO4 − ] = 0.3...
04 Question (1 point) @ See page 729 A buffer solution inckudes a weak acid and...
04 Question (1 point) @ See page 729 A buffer solution inckudes a weak acid and its conjugate base. 4th attempt Feedback del See Periodic Table ’See Hint Include states of matter. Write a balanced chemical equation for the equilibrium reaction occurring in a buffer containing NH3 and NHACI. Write the equation so that its equilibrium constant is equivalent to Ka NH;(aq) + H2O(1) _ NII;(aq) +OH"(aq) 3rd attemnt 04/18 TRY AGAIN VIEW SOLUTION C 14 OF 18 QUESTIONS COMPLETED
4 4. a) Parts (a) and (b) below are separate independent problems For each of the...
4 4. a) Parts (a) and (b) below are separate independent problems For each of the following, write a balanced net-ionic equation for the acid-base neutralization reaction that occurs (omitting any spectator ions), and determine the value of the equilibrium constant K for the reaction. Be sure to include phases (such as (aq) or ()) in your reactions. The first one is done for you as an example. (8 pts) Example: Solutions of HBr (ag) and KOH (aq) are mixed...
2. Calculate the pH of the following solutions: (a) [H3O+] = 1.4 x 10-'M (b) [OH-]...
2. Calculate the pH of the following solutions: (a) [H3O+] = 1.4 x 10-'M (b) [OH-] = 3.5 x 10-2M (c) pOH = 10.5 3. What is the pH of a 0.10 M solution of HCIO4? (A strong acid) 4. Write the dissociation reaction and the corresponding K, expression for the following acids in water. (a) H3PO4 (b) C&H OH 5. Write the reaction and corresponding Ko expression for each of the following bases in water. (a) NH3 (b) PO4...
21. Which of the following solutions will be the best buffer at a pH of 9.26?...
21. Which of the following solutions will be the best buffer at a pH of 9.26? (K, for HC2H,02 is 1.8 × 10-5, Kb for NH3 is 1.8 × 10-5.) A) 0.20 M NH3 and 0.20 MNH4Cl B) 3.0 M HC2H3O2 and 3.0 M NH4CI C) 0.20 M HC2H302 and 0.20 M NaC2H302 D) 3.0 M NH3 and 3.0 M NH4CI E) 3.0 M HC2H302 and 3.0 M NH3 PTS: 1 DIF: moderate TOP: 8.2 8.3 ANS: D KEY: general...
36) Which one of the following is not a strong acid? (or a weak electrolyte?) a) HNO )HCI HI )HF e) HCIO Answer: 37) The is the conjugate species that remains after an acid donates a proton is ca...
36) Which one of the following is not a strong acid? (or a weak electrolyte?) a) HNO )HCI HI )HF e) HCIO Answer: 37) The is the conjugate species that remains after an acid donates a proton is called its conjugate base. What base of the hydronium ion, HO? B)HO C)HO D)H E HO'has no conjugate base. Answer: acid-base pair? 38) For the reaction shown below, which of the following is a conjugate acid A)CHsN, H:0 B) CsH,N, CsH,NH' C)...
Question 5 1 pts A student mixes HCl and NaCl (source of conjugate) and claims to have made a buffer. Is this claim accurate? Yes- it is a mixture of acid and conjugate base after all Yes- any acid with a conjugate can make a buffer Oo oo C No-the conjugate base is so weak it does not reach equilibrium with water Need more information Question 6 1 pts Which combination of acid and base would create a buffer? Assume...
3.(16.3) Identify all the correct statements about an acid-base buffer solution. I. It can be prepared by combining a strong acid with a salt of its conjugate base. II. It can be prepared by combining a weak acid with a salt of its conjugate base. III. It can be prepared by combining a weak base with its conjugate acid. IV. The pH of a buffer solution does not change when the solution is diluted. V. A buffer solution resists changes...
04 Question (1 point) @ See page 729 A buffer solution inckudes a weak acid and its conjugate base. 4th attempt Feedback del See Periodic Table ’See Hint Include states of matter. Write a balanced chemical equation for the equilibrium reaction occurring in a buffer containing NH3 and NHACI. Write the equation so that its equilibrium constant is equivalent to Ka NH;(aq) + H2O(1) _ NII;(aq) +OH"(aq) 3rd attemnt 04/18 TRY AGAIN VIEW SOLUTION C 14 OF 18 QUESTIONS COMPLETED
4 4. a) Parts (a) and (b) below are separate independent problems For each of the following, write a balanced net-ionic equation for the acid-base neutralization reaction that occurs (omitting any spectator ions), and determine the value of the equilibrium constant K for the reaction. Be sure to include phases (such as (aq) or ()) in your reactions. The first one is done for you as an example. (8 pts) Example: Solutions of HBr (ag) and KOH (aq) are mixed...
2. Calculate the pH of the following solutions: (a) [H3O+] = 1.4 x 10-'M (b) [OH-] = 3.5 x 10-2M (c) pOH = 10.5 3. What is the pH of a 0.10 M solution of HCIO4? (A strong acid) 4. Write the dissociation reaction and the corresponding K, expression for the following acids in water. (a) H3PO4 (b) C&H OH 5. Write the reaction and corresponding Ko expression for each of the following bases in water. (a) NH3 (b) PO4...
21. Which of the following solutions will be the best buffer at a pH of 9.26? (K, for HC2H,02 is 1.8 × 10-5, Kb for NH3 is 1.8 × 10-5.) A) 0.20 M NH3 and 0.20 MNH4Cl B) 3.0 M HC2H3O2 and 3.0 M NH4CI C) 0.20 M HC2H302 and 0.20 M NaC2H302 D) 3.0 M NH3 and 3.0 M NH4CI E) 3.0 M HC2H302 and 3.0 M NH3 PTS: 1 DIF: moderate TOP: 8.2 8.3 ANS: D KEY: general...
36) Which one of the following is not a strong acid? (or a weak electrolyte?) a) HNO )HCI HI )HF e) HCIO Answer: 37) The is the conjugate species that remains after an acid donates a proton is called its conjugate base. What base of the hydronium ion, HO? B)HO C)HO D)H E HO'has no conjugate base. Answer: acid-base pair? 38) For the reaction shown below, which of the following is a conjugate acid A)CHsN, H:0 B) CsH,N, CsH,NH' C)...
Most questions answered within 3 hours.
-
5. Discuss the use of fault tree analysis (FTA) for risk
assessment (maximum one paragraph).
asked 8 minutes ago -
Given that a sample of aluminium oxide has a Young's modulus of
393 GPa and a...
asked 1 hour ago -
At a certain temperature, the equilibrium constant, Kc, for this
reaction is 53.3.
H2(g)+I2(g)−⇀↽−2HI(g)Kc=53.3
At this...
asked 2 hours ago -
Question1 ) The STL provides similiar classes called stack and
queue, both of which gave functions...
asked 3 hours ago -
For Questions 1-4, assume you have 5 bits available:
1. For (positive) integers: What is the...
asked 4 hours ago -
convert grams into vloume with the density of water being at
.997514 g/cm^3 at 23.1 Celsuis...
asked 6 hours ago -
Foreman company obtained a $20,000, 6% loan on May 1, 2018.
Principal and interest will be...
asked 6 hours ago -
5. Problem 11.05 (Discounted Payback)
eBook
Project L costs $60,000, its expected cash inflows are $14,000
per...
asked 6 hours ago -
1. Which of the following is true about politics and health
organizations?
A. Health organizations are...
asked 7 hours ago -
A space vehicle is coasting at a constant velocity of 18.1 m/s
in the +y direction...
asked 8 hours ago -
5) Use the following balanced equation to answer questions
(a)-(i).
3 Cu(s) + 8 HNO3(aq) →...
asked 7 hours ago -
A three-year maturity bond with a 12% annual coupon rate is
currently traded at par $1000...
asked 7 hours ago