B. Calculate the pH after 17.50 mL of NAOH is added to 35.00 mL of acetic acid using the concentration assigned in Beyond Labz: • First assume the acid-base neutralization reaction is irreversible and goes to completion: HC2H;O2 (ag) + OH° (ag) - H2O (1) + C;H;O;" (ag) Moles before reaction Change in moles Moles remaining after reaction • Then equilibrium is established HC;H;O2 (ag) 2H* (ag) + C;H;O2 (ag) Initial Concentration (M) Change in Concentration (M) Equilibrium Concentration (M) E Equilibrium Concentration, Calculated (M) Show your work here or replicate this on a separate piece of paper. Number and label each calculation, include units, and show the math performed to get your answer. Report answers with correct units and significant figures.

Chemical Principles in the Laboratory
11th Edition
ISBN:9781305264434
Author:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Publisher:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Chapter21: Rates Of Chemical Reactions, Ii. A Clock Reaction
Section: Chapter Questions
Problem 2ASA
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Question

Acetic Acid = 0.1033 M

Ka = 1.8 x 10-5

Sodium hydroxide = 0.1104 M

The first picture are the data, if needed

second picture are the ones needs to be solved

HC2H3O2
H+
+
C2H302-
Initial
0.1033
Change
Equilibrium
1. Initial concentration [HC2H3O2]o = 0.1033 M
-X
+X
+X
0.1033-x
X
[H*][C2H307]
2. Ka symbolic expression: Ka
[HC2H302]
x2
3. Ka numerical equation with x: 1.8 x 10-5
0.1033-x
4. Quadratic formula method
a. quadratic equation: x2 + 1.8x10-5x – 1.86x10-6 = 0
%3D
-1.8x10-5+V (1.8x10-5)2-4(1)(-1.86×10-6)
b. quadratic formula: x =
2(1)
x = 1.35x10-3 M; -1.37x103 M (only positive root is used)
5. Assumption (5% rule) method
a. equation for x: x =
V(1.8 x 10-5)(0.1033) = 1.36 × 10-3M
1.36x10-3 M
b. % ionization =
x 100 = 1.32%
0.1033 M
6. Equilibrium concentrations
a. [HC2H3O2leg = 0.1033 – 1.35x10-3 = 0.1020 M
%3D
%3D
b. [H*]eg = 1.35x10-3 M
Jeq
c. [C2H3O2]eg = 1.35x10-3 M
7. pH = -log[H*] = -log(1.35x10 3) = 2.87
Transcribed Image Text:HC2H3O2 H+ + C2H302- Initial 0.1033 Change Equilibrium 1. Initial concentration [HC2H3O2]o = 0.1033 M -X +X +X 0.1033-x X [H*][C2H307] 2. Ka symbolic expression: Ka [HC2H302] x2 3. Ka numerical equation with x: 1.8 x 10-5 0.1033-x 4. Quadratic formula method a. quadratic equation: x2 + 1.8x10-5x – 1.86x10-6 = 0 %3D -1.8x10-5+V (1.8x10-5)2-4(1)(-1.86×10-6) b. quadratic formula: x = 2(1) x = 1.35x10-3 M; -1.37x103 M (only positive root is used) 5. Assumption (5% rule) method a. equation for x: x = V(1.8 x 10-5)(0.1033) = 1.36 × 10-3M 1.36x10-3 M b. % ionization = x 100 = 1.32% 0.1033 M 6. Equilibrium concentrations a. [HC2H3O2leg = 0.1033 – 1.35x10-3 = 0.1020 M %3D %3D b. [H*]eg = 1.35x10-3 M Jeq c. [C2H3O2]eg = 1.35x10-3 M 7. pH = -log[H*] = -log(1.35x10 3) = 2.87
B. Calculate the pH after 17.50 mL of N2OH is added to 35.00 mL of acetic acid using the concentration
assigned in Beyond Labz:
• First assume the acid-base neutralization reaction is irreversible and goes to completion:
田
HC;H;O2 (ag)
+ Он (ag)
→ H2O ()
+ C;H3O2 (aq)
Moles before reaction
Change in moles
Moles remaining after reaction
Then equilibrium is established
HC;H;O2 (ag)
2H* (ag)
+ C;H;O2 (aq)
I
Initial Concentration (M)
Change in Concentration (M)
Equilibrium Concentration (M)
E
Equilibrium Concentration,
Calculated (M)
Show your work here or replicate this on a separate piece of paper. Number and label each calculation, include
units, and show the math performed to get your answer. Report answers with correct units and significant
figures.
Transcribed Image Text:B. Calculate the pH after 17.50 mL of N2OH is added to 35.00 mL of acetic acid using the concentration assigned in Beyond Labz: • First assume the acid-base neutralization reaction is irreversible and goes to completion: 田 HC;H;O2 (ag) + Он (ag) → H2O () + C;H3O2 (aq) Moles before reaction Change in moles Moles remaining after reaction Then equilibrium is established HC;H;O2 (ag) 2H* (ag) + C;H;O2 (aq) I Initial Concentration (M) Change in Concentration (M) Equilibrium Concentration (M) E Equilibrium Concentration, Calculated (M) Show your work here or replicate this on a separate piece of paper. Number and label each calculation, include units, and show the math performed to get your answer. Report answers with correct units and significant figures.
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