Homework Answers
18.
Correct option: a
HNO2 is an is a weak acid. Therefore, it partially dissociates in water. On addition of a strong base, HNO2 will convert to KNO2. KNO2 is a salt and it completely dissociates in water. Hence, the nitrite ion concentration will increase if a strong base is added.
Option b is incorrect as pH = pKa when [KNO2] = [HNO2]. But here, [HNO2] = 2 x [KNO2].
Option c is incorrect as pKa of an acid is a constant.
Already the solution has more concentration of acid. Hence, addition of a strong acid will diminish the buffer capacity by converting KNO2 to HNO2. Hence, option d is incorrect.
Add Answer to:
18. Consider a buffer solution containing HNO, and KNO, where the concentration of HNO2 is double...
19. If 25 mL of .875 M HNO; is combined with 100.0 mL of 0.167 M...
19. If 25 mL of .875 M HNO; is combined with 100.0 mL of 0.167 M NaOH what is the final pH? (Assume that the volumes are additive.) (d) 1.38 b) 2.28 c) 11.72 d) 12.62 strong
of Jestion Consider a buffer of HNO/NO, 1. To create the buffer, solid NaNO (MM =...
of Jestion Consider a buffer of HNO/NO, 1. To create the buffer, solid NaNO (MM = 68.995 g/mol) was added to a 500.0-ml 1.25 M HNO2 solution. The pka of HNO2 is 3.37. i. What mass needs to be added in order to have a buffer with pH 3.20. ii. If 10.0-mL of 2.50 M NaOH is added to the buffer prepared in i., what is the pH of the solution.
At a concentration of 1 M, the weak acid HNO, is 2% ionized, and the pH...
At a concentration of 1 M, the weak acid HNO, is 2% ionized, and the pH of the solution is 1.7. What happens when KNO, (s) is dissolved into the solution? The extent of HNO, ionization The concentration of H+ The pH You need to prepare 100.0 mL of a pH 4.00 buffer solution using 0.100 M benzoic acid (pK. = 4.20) and 0.180 M sodium benzoate. How many milliliters of each solution should be mixed to prepare this buffer?...
This is all info given A buffer solution that is 0.448 M in HNO2 and 0.448...
This is all info given
A buffer solution that is 0.448 M in HNO2 and 0.448 M in KNO, has a pH of 3.35. The addition of 0.01 mol of OH to 1.0 L of this buffer would cause the pH t increase slightly The capacity of this buffer for added OH could be increased by the addition increase by 2 units decrease slightly decrease by 2 units not change A buffer solution that is 0.448 M in HNO2 and...
(YES/NO) (ADDED ACID/ADDED BASE) A buffer solution that is 0.322 M in HNO2 and 0.322 M...
(YES/NO) (ADDED ACID/ADDED BASE)
A buffer solution that is 0.322 M in HNO2 and 0.322 M in NaNO, has a pH of 3.35. Addition of which of the following would increase the capacity of the buffer for added OH"? (Select all that apply.) OHNO2 pure water O both HNO, and NaNO2 NaNO2 Onone of the above Use the References to access important values if needed for this question. The PK, value for HNO2 is 3.35. Would a buffer prepared from...
16. Determine the [H3O+] concentration in a 0.169 M NaOH solution. A) 0.338 M B )...
16. Determine the [H3O+] concentration in a 0.169 M NaOH solution. A) 0.338 M B ) 0.169 M C) 5.92 x 10-14 M. D) 2.96 x 10-14 M. E) 0.298 M B. p 17. A solution is prepared by adding 100 mL of 0.4M HNO2 to 100 mL of 0.5 M KNO2. What is the best answer to the solution pH? A. pH >pka B. pH <pka C. It is a buffer, pH = pka D. pH = pKb E....
A buffer solution consists of 0.10 M HNO2 and 0.20 M NaNO2. If 0.010 moles of...
A buffer solution consists of 0.10 M HNO2 and 0.20 M NaNO2. If 0.010 moles of sodium hydroxide are added to 200. ml the solution , what is the new pH of the solution (pKa (HNO2) = 3.40)?
please help me with these questions! At a concentration of 1 M, the weak acid HNO,...
please help me with these questions!
At a concentration of 1 M, the weak acid HNO, is 2% ionized, and the pH of the solution is 1.7. What happens when KNO,() is dissolved into the solution? The extent of HNO, ionization The concentration of H+ The pH If a buffer solution is 0.260 M in a weak acid (K, = 6.0 x 10 ) and 0.500 M in its conjugate base, what is the pH? A 0.194 g sample of...
3. You are asked to make a buffer solution with a pH of 3.40 by using...
3. You are asked to make a buffer solution with a pH of 3.40 by using 0.100 M HNO, and 0.100 M NaOH (aq). a. Explain why the addition of 0.100 M HNO2 to 0.100 M NaOH(aq) can result in the formation of a buffer solution. Include the net ionic equations for the reaction that occurs when you combine HNO2 (aq) and NaOH(aq). Determine the volume, in ml, of 0.100 NaOH(aq) the student should add to 100 mL of 0.100...
A buffer solution is prepared by mixing 23.6 mL of 0.398 M sodium dihydrogen citrate with...
A buffer solution is prepared by mixing 23.6 mL of 0.398 M sodium dihydrogen citrate with 36.6 mL of 0.881 M sodium hydrogen citrate A table of pKa values can be found here 1. Calculate the pH (to two decimal places) of this solution Assume the 5% approximation is valid and that the volumes are additive. Submit Answer Tries 0/3 2. Calculate the pH (to two decimal places) of the buffer solution after the addition of 24.9 mL of a...
19. If 25 mL of .875 M HNO; is combined with 100.0 mL of 0.167 M NaOH what is the final pH? (Assume that the volumes are additive.) (d) 1.38 b) 2.28 c) 11.72 d) 12.62 strong
of Jestion Consider a buffer of HNO/NO, 1. To create the buffer, solid NaNO (MM = 68.995 g/mol) was added to a 500.0-ml 1.25 M HNO2 solution. The pka of HNO2 is 3.37. i. What mass needs to be added in order to have a buffer with pH 3.20. ii. If 10.0-mL of 2.50 M NaOH is added to the buffer prepared in i., what is the pH of the solution.
At a concentration of 1 M, the weak acid HNO, is 2% ionized, and the pH of the solution is 1.7. What happens when KNO, (s) is dissolved into the solution? The extent of HNO, ionization The concentration of H+ The pH You need to prepare 100.0 mL of a pH 4.00 buffer solution using 0.100 M benzoic acid (pK. = 4.20) and 0.180 M sodium benzoate. How many milliliters of each solution should be mixed to prepare this buffer?...
This is all info given
A buffer solution that is 0.448 M in HNO2 and 0.448 M in KNO, has a pH of 3.35. The addition of 0.01 mol of OH to 1.0 L of this buffer would cause the pH t increase slightly The capacity of this buffer for added OH could be increased by the addition increase by 2 units decrease slightly decrease by 2 units not change A buffer solution that is 0.448 M in HNO2 and...
(YES/NO) (ADDED ACID/ADDED BASE)
A buffer solution that is 0.322 M in HNO2 and 0.322 M in NaNO, has a pH of 3.35. Addition of which of the following would increase the capacity of the buffer for added OH"? (Select all that apply.) OHNO2 pure water O both HNO, and NaNO2 NaNO2 Onone of the above Use the References to access important values if needed for this question. The PK, value for HNO2 is 3.35. Would a buffer prepared from...
16. Determine the [H3O+] concentration in a 0.169 M NaOH solution. A) 0.338 M B ) 0.169 M C) 5.92 x 10-14 M. D) 2.96 x 10-14 M. E) 0.298 M B. p 17. A solution is prepared by adding 100 mL of 0.4M HNO2 to 100 mL of 0.5 M KNO2. What is the best answer to the solution pH? A. pH >pka B. pH <pka C. It is a buffer, pH = pka D. pH = pKb E....
please help me with these questions!
At a concentration of 1 M, the weak acid HNO, is 2% ionized, and the pH of the solution is 1.7. What happens when KNO,() is dissolved into the solution? The extent of HNO, ionization The concentration of H+ The pH If a buffer solution is 0.260 M in a weak acid (K, = 6.0 x 10 ) and 0.500 M in its conjugate base, what is the pH? A 0.194 g sample of...
3. You are asked to make a buffer solution with a pH of 3.40 by using 0.100 M HNO, and 0.100 M NaOH (aq). a. Explain why the addition of 0.100 M HNO2 to 0.100 M NaOH(aq) can result in the formation of a buffer solution. Include the net ionic equations for the reaction that occurs when you combine HNO2 (aq) and NaOH(aq). Determine the volume, in ml, of 0.100 NaOH(aq) the student should add to 100 mL of 0.100...
A buffer solution is prepared by mixing 23.6 mL of 0.398 M sodium dihydrogen citrate with 36.6 mL of 0.881 M sodium hydrogen citrate A table of pKa values can be found here 1. Calculate the pH (to two decimal places) of this solution Assume the 5% approximation is valid and that the volumes are additive. Submit Answer Tries 0/3 2. Calculate the pH (to two decimal places) of the buffer solution after the addition of 24.9 mL of a...
Most questions answered within 3 hours.
-
The time to complete a standardized exam is approximately normal
with a mean of 70 minutes...
asked 1 hour ago -
Two thousand randomly selected adults were asked whether or not
they have ever shopped on the...
asked 1 hour ago -
Estimate the diffusion coefficient for methyl phenyl sulfide in
water at 25 degrees Celcius.
asked 1 hour ago -
10.g of a certain metal absorb 40. cal of heat and the temperature
is abserved to...
asked 2 hours ago -
How many milliliters of 0.0695 M Ca( OH)
2would be required to exactly neutralize 176 mL...
asked 2 hours ago -
A telephone survey uses a random digit dialing machine to call
subjects. The random digit dialing...
asked 3 hours ago -
How can having too little or too much of a certain
protein cause problems for an...
asked 4 hours ago -
Assume a muscle has a PCSA = 20 cm2 and Lo = 12 cm. Assume it...
asked 6 hours ago -
What is the yield to maturity of a ten-year, $1,000 bond with a
5.2% coupon rate...
asked 6 hours ago -
A mass m = 5 kg is tied on one end of a rope and is...
asked 6 hours ago -
The Average sales price of single-family houses in Charlotte is
$210,000 with a standard deviation of...
asked 7 hours ago -
Target Costing
Laser Impressions, Inc., manufactures color laser printers.
Model J20 presently sells for $225 and...
asked 7 hours ago