Question
In: Chemistry
Consider a buffer made by adding 132.8 g of NaC₇H₅O₂ to 300.0 mL of 2.15 M...
Consider a buffer made by adding 132.8 g of NaC₇H₅O₂ to 300.0 mL of 2.15 M HC₇H₅O₂ (Ka = 6.3 x 10⁻⁵) What is the pH of the buffer after 0.750 mol of H⁺ have been added?
Solutions
Expert Solution
no of moles of NaC7H5O2 = W/G.M.Wt
= 132.8/144 = 0.923moles
no of moles of HC7H5O2 = molarity * volume in L
= 2.15*0.3 = 0.645moles
PKa = -logKa
= -log(6.3*10^-5)
= 4.2
no of moles of NaC7H5O2 after adding 0.750 mol of H^+ = 0.923-0.75 = 0.173 moles
no of moles of HC7H5O2 after adding 0.750mol of H^+ = 0.645+0.75 = 1.395moles
PH = Pka + log[NaC7H5O2]/[HC7H5O2]
= 4.2 + log0.173/1.395
= 4.2 -0.9065
= 3.2935>>>>answer
queen_honey_blossom answered 8 months agoRelated Solutions
A buffer is prepared by adding 300.0 mL of 0.050 M Ch3COONa to a 500.0 mL...
A buffer is prepared by adding 300.0 mL of 0.050 M Ch3COONa to a
500.0 mL of 0.100 M CH3COOH. What is the pH of this buffer?
Ka=1.8x10^-5
What is the pH of the buffer upon the addition of 10.0 mL of a
1.2x10^-3 M HCl solution?
A 300.0 mL buffer solution is 0.230 M in acetic acid and 0.230 M in sodium...
A 300.0 mL buffer solution is 0.230 M in acetic acid and 0.230 M
in sodium acetate.
Part A: What is the initial pH of this solution?
Part B: What is the pH after addition of 0.0050 mol of HCl?
Part C: What is the pH after addition of 0.0050 mol of NaOH?
A 300.0 mL buffer solution is 0.220 M in acetic acid and 0.220 M in sodium...
A 300.0 mL buffer solution is 0.220 M in acetic acid
and 0.220 M in sodium acetate.
What is the initial pH of this solution?
What is the pH after addition of 0.0100 mol of HCl?
What is the pH after addition of 0.0100 mol of NaOH?
Please explain I don't understand how to do this.
thank you!
A buffer solution was prepared by mixing 300.0 mL of a 0.200 M solution of hydroxylamine...
A buffer solution was prepared by mixing 300.0 mL of a 0.200 M
solution of hydroxylamine (OHNH2, Kb = 1.1 × 10-8) and 250.0 mL of
a 0.300 M solution of its hydrochloride salt (OHNH3+ Cl- ).
Calculate the pH of the solution after the addition of 1.08 g of
solid NaOH (molar mass = 40.00 g/mol). Assume that there is no
volume change upon the addition of solid.
A buffer solution was prepared by mixing 300.0 mL of a 0.200 M solution of hydroxylamine...
A buffer solution was prepared by mixing 300.0 mL of a 0.200 M
solution of hydroxylamine (OHNH2, Kb = 1.1 ×
10-8) and 250.0 mL of a 0.300 M solution of its
hydrochloride salt (OHNH3+ Cl- ).
Calculate the pH of the solution after the addition of 1.08 g of
solid NaOH (molar mass = 40.00 g/mol). Assume that there is no
volume change upon the addition of solid.
A.
8.22
B.
5.55
C.
6.30
D.
5.78
A buffer is prepared by adding 108 mL of 0.48 M NH3 to 143 mL of...
A buffer is prepared by adding 108 mL of 0.48 M NH3 to 143 mL of
0.30 M NH4NO3. What is the pH of the final solution?
A buffer is prepared by adding 150 mL of 1.0 M NaOH to 250 mL of...
A buffer is prepared by adding 150 mL of 1.0 M NaOH to 250 mL of
1.0 M NaH2PO4. How many moles of HCl must be
added to this buffer solution to change the pH by 0.25 units?
Assume the total volume remains unchanged at 400 mL.
For H2PO4-, Ka = 6.3 ×
10-8.
A solution is made by adding 0.330 g Ca(OH)2(s), 40.0 mL of 1.00 M HNO3, and...
A solution is made by adding 0.330 g Ca(OH)2(s), 40.0 mL of 1.00
M HNO3, and enough water to make a final volume of 75.0 mL.
A)Assuming that all of the solid dissolves, what is the pH of
the final solution?
1. For a buffer solution that is made of 200.0 mL of 0.300 M HCLO with...
1. For a buffer solution that is made of 200.0 mL of 0.300 M
HCLO with 100.0 mL of 0.200 M KCLO. The Ka for HCLO is 2.9*10^8.
What is the PH of the buffer?
2. Consider the same solution. To this solution, if 10.00 mL of
0.100 M HCl is added, what is the new pH?
*both answers to 2 decimal places*
A solution is made by mixing 31.0 mL of ethanol, C 2 H 6 O ,...
A solution is made by mixing 31.0 mL of ethanol, C 2 H 6 O , and
69.0 mL of water. Assuming ideal behavior, what is the vapor
pressure of the solution at 20 ∘ C? The relevant values at 20 ∘ C
are included in the table.
Liquid Density (g/mL) Vapor Pressure, ?∘ (Torr)
ethanol 0.789 43.9
water 0.998 17.5
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- Post your article about Business and the Environment Post your article here and include the following...
- A comparative statement of financial position for Sheffield Industries Inc. follows: SHEFFIELD INDUSTRIES INC. Statement of...
- A 4 cylinder 4 stroke 2.3 L diesel engine with bore = 12.4 cm and stroke...
- By using Managerial,communication or operational processes use the steps to write a case study on Pepsi...
- money is probably the most important reward for every employee and employers constantly ask themselves how...
- Fatima is 86 years old female admitted to emergency room complains of skin tear of her...
- Speculate on the main reasons why the skills and training of project managers have changed over...
ADVERTISEMENT