A buffer solution is prepared by mixing 50.0 mL of 0.300 M NH3(aq) with 50.0 mL...
A buffer solution is prepared by mixing 50.0 mL of 0.300 M NH3(aq) with 50.0 mL of 0.300 M NH4Cl(aq). The pKb of NH3 is 4.74.
Calculate the NH3 concentration in the buffer solution.
Calculate the NH4Cl concentration in the buffer solution.
Calculate the pH of the buffer solution.
7.50 mL of 0.125 M NaOH is added to the 100.0 mL of the original
buffer solution prepared in Question 1. Calculate the new NH3
concentration for the buffer solution.
Calculate the new NH4Cl concentration for the buffer
solution.
Calculate the new pH of the solution.
Homework Answers
1)
Given data,
Volume = 50.0 mL
Total volume = 50 + 50
= 100ml
pKb = 4.74
dilution factor = 2
[NH3] = 0.300M / 2
[NH3] = 0.150M
[NH4Cl] = 0.300M / 2
[NH4Cl] = 0.150M
According to Henderson-Hassel-balch equation,
pOH = pKb + log([BH+] / [B])
BH+ = NH4+ and
B = NH3
pOH = 4.74 + log(0.150M / 0.150M)
pOH = 4.74 + log 1
pH = 14 - pOH
pH = 14 - 4.74
pH = 9.26
2)
Let us consider a reaction,
NH3 + HCl - - - - - - > NH4+ + Cl-
Initial moles of NH3 = (0.150mol / 1000ml) × 100ml
= 0.0150
Initial moles of NH4+ = (0.150mol / 1000ml) × 100ml
= 0.0150
No of moles of HCl added = (0.125mol / 1000ml) × 7.50ml
= 0.0009375
No of moles of NH3 after addition of HCl = 0.0150 - 0.0009375
= 0.0140625
No of moles of NH4+ after addition of HCl = 0.0150 + 0.0009375
= 0.0159375
Total volume = 100 + 7.50
= 107.50ml
[NH3] = (0.0140625mol / 107.50ml) × 1000ml
= 0.000130 x 1000 mL
= 0.1308M
[NH4+] = (0.0159375mol / 107.50ml) × 1000ml
= 0.1483M
According to the Henderson - Hasselbalch equation
pOH = pKb + log([BH+] /[B])
pOH = 4.74 + log(0.1483M/0.1308M)
pOH = 4.74 + 0.05
pOH = 4.79
We know pH + pOH = 14
pH = 14 - 4.79
= 9.21
3)
Let us consider a reaction,
NH4+ + OH- - - - - - - - > NH3 + H2O
No of moles of OH- added = (0.125mol / 1000ml) × 7.50ml
= 0.0009375
No of moles of NH3 after addition of NaOH = 0.0150+0.0009375
= 0.0159375M
No of moles of NH4+ after addition of NaOH = 0.0150 - 0.0009375
= 0.0140625
Total Volume = 107.50ml
[NH3] = (0.0159375mol / 107.50ml) × 1000ml
= 0.1483M
[NH4+] = (0.0140625mol / 107.50ml) × 1000ml
= 0.1308M
Applying Henderson-Hassel -balch equation
pOH = pKb + log([BH+] /[B])
pOH = 4.74 + (0.1308M/0.1483M)
pOH = 4.69
pH = 14 - 4.69
pH = 9.31
Add Answer to:
A buffer solution is prepared by mixing 50.0 mL of 0.300 M
NH3(aq) with 50.0 mL...
1) Consider a buffer solution that is prepared by mixing 1000 mL of O.500 M NHs with 100.0 mL of0...
1) Consider a buffer solution that is prepared by mixing 1000 mL of O.500 M NHs with 100.0 mL of0.400 MNH CL Record all answers to at least 3 sig figs and watch out for rounding errors. la) Calculate the pH of this buffer lb) Calculate the pll of this buffer after 200 mg of NaOH is added to the original buffer solution in la. Ic) Calculate the pH of this buffer after 50 mL of0.200 M HCI is added...
Consider a buffer prepared by mixing 75ml of 0.03640 M ammonia (NH3) solution with 28ml of...
Consider a buffer prepared by mixing 75ml of 0.03640 M ammonia (NH3) solution with 28ml of 0.02454 M ammonium chloride solution (pKb of ammonia is 4.75) 5. If you added 1 mL of 0.2550 M NaOH to 103 mL of pure water, what would the pH be?
1) A buffer can be prepared by mixing two solutions. Determine if each of the following...
1)
A buffer can be prepared by mixing two solutions. Determine if
each of the following mixtures will result in a buffer solution or
not.
1) Mixing 100.0 mL of 0.1 M HCl with 100.0 mL of 0.1 M NaOH
[
Select ]
["No, it will not result in
a buffer solution.", "Yes, it will result in a buffer solution."]
2) Mixing...
1) Calculate the pH of a solution produced by mixing 100.0 mL of 0.10 M HCl(aq)...
1) Calculate the pH of a solution produced by mixing 100.0 mL of 0.10 M HCl(aq) and 100.0 mL of 0.20 M NaOH(aq). 2) Calculate the pH of an aqueous solution made by mixing 100.0 mL of 0.40 M NH4Cl and 50.0 mL of 0.40 M NaOH. The pKa of NH4+ is 9.24.
a) Calculate the pH of a buffer system that contains o.200 M of NH3(aq) and o.200...
a) Calculate the pH of a buffer system that contains o.200 M of NH3(aq) and o.200 M of NH4Cl(aq). The Kb of NH3(aq) is 18 x 10-5. Consult Textbook Numerical Answer pH b) Calculate the change in pH when 6.00 mL of 100 M HCl is added to 100.0 mL of the buffer solution. Numerical Answer: c) Calculate the change in pH when 6.00 mL of o.100 M NaOH is added to 100.0 mL of the buffer solution. Numerical Answer:
Calculate the change in pH when 3.00 mL of 0.100 M HCl(aq) is added to 100.0...
Calculate the change in pH when 3.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). NH3 Kb=1.8x10^-5 Calculate the change in pH when 3.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.
Consider a buffer prepared by mixing 75ml of 0.03640 M ammonia (NH3) solution with 28ml of...
Consider a buffer prepared by mixing 75ml of 0.03640 M ammonia (NH3) solution with 28ml of 0.02454 M ammonium chloride solution (pKb of ammonia is 4.75) 1. What will the pH be? 2. If you add 1 mL of 0.1780 M HCl, what will the new pH be?
3. (a) Calculate the change in pH when 5.00 mL of 0.100 M HCl(aq) is added...
3. (a) Calculate the change in pH when 5.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). (b) Calculate the change in pH when 5.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.
2) a) Calculate the change in pH when 8.00 mL of 0.100 M HCl(aq) is added...
2) a) Calculate the change in pH when 8.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). delta pH= ? b) Calculate the change in pH when 8.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution. delta pH= ?
Calculate the change in pH when 5.00 mL of 0.100 M HCl(aq) is added to 100.0...
Calculate the change in pH when 5.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). Consult the table of ionization constants as needed. Calculate the change in pH when 5.00 mL of 0.100 M NaOH is added to the original buffer solution.
1) Consider a buffer solution that is prepared by mixing 1000 mL of O.500 M NHs with 100.0 mL of0.400 MNH CL Record all answers to at least 3 sig figs and watch out for rounding errors. la) Calculate the pH of this buffer lb) Calculate the pll of this buffer after 200 mg of NaOH is added to the original buffer solution in la. Ic) Calculate the pH of this buffer after 50 mL of0.200 M HCI is added...
1)
A buffer can be prepared by mixing two solutions. Determine if
each of the following mixtures will result in a buffer solution or
not.
1) Mixing 100.0 mL of 0.1 M HCl with 100.0 mL of 0.1 M NaOH
[
Select ]
["No, it will not result in
a buffer solution.", "Yes, it will result in a buffer solution."]
2) Mixing...
a) Calculate the pH of a buffer system that contains o.200 M of NH3(aq) and o.200 M of NH4Cl(aq). The Kb of NH3(aq) is 18 x 10-5. Consult Textbook Numerical Answer pH b) Calculate the change in pH when 6.00 mL of 100 M HCl is added to 100.0 mL of the buffer solution. Numerical Answer: c) Calculate the change in pH when 6.00 mL of o.100 M NaOH is added to 100.0 mL of the buffer solution. Numerical Answer:
3. (a) Calculate the change in pH when 5.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). (b) Calculate the change in pH when 5.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago