Question

D) Calculate the concentration of CH3CO2H in 1.35 MCH3CO2H. E) Calculate the concentration of OH− in...

D) Calculate the concentration of CH3CO2H in 1.35 MCH3CO2H.

E) Calculate the concentration of OH− in 1.35 MCH3CO2H.

F) Calculate the pH of 0.0234 MCH3CO2H.

G) Calculate the concentration of H3O+ in 0.0234 MCH3CO2H.

H)Calculate the concentration of CH3CO−2 in 0.0234 MCH3CO2H

I)Calculate the concentration of CH3CO2H in 0.0234 MCH3CO2H.

J) Calculate the concentration of OH− in 0.0234 MCH3CO2H.

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Answer #1

  weak acid [Acetic acid] = 1.35M

CH3CO2H H2O CH3CO- H3O+
ni 1.35 -- --
nrx -x +x +x
neq 1.35-x x x

x=0.000155M

D) [CH3CO2H]=1.34 M

E) pKw=14=pOH+pH = pOH+(-log[0.000155])=pOH+3.81

pOH = 14 -3.81=10.19M

[OH-] = !0-10.19 = 6.45*10-11 M

F)

  weak acid [Acetic acid] = 0.0234M

CH3CO2H H2O CH3CO- H3O+
ni 0.0234 -- --
nrx -x +x +x
neq 0.0234-x x x

x=0.000020M

pH = 4.69

G) [H3O+] = 0.000020M

H) [CH3COO-] = 0.000020M

I) [CH3COOH] = 0.0234-.0.00002=0.02338M

J) 14 =pH+pOH

pOH = 14-pH = 14- 4.69=9.31

[OH-] = 10-9.31 = 4.89*10-10 M

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