Constants| Periodic Table Part D Acetic acid, CH3 CO2H is the solute that gives
ID: 574398 • Letter: C
Question
Constants| Periodic Table Part D Acetic acid, CH3 CO2H is the solute that gives vinegar its characteristic odor and sour taste Calculate the concentration of CH3 CO2 H in 1.79 M CH CO2H Express your answer to two significant figures and include the appropriate units ValueUnits Submit uest Answer Part E Calculate the concentration of OH in 1.79 M CH3 CO2H Express your answer to two significant figures and include the appropriate units ValueUnits Submit uest Answer Part F Calculate the pH of 0.0181 M CH3 CO2H. Express your answer using two decimal places Submit uest AnswerExplanation / Answer
CH3CO2H ------------------> CH3CO2^- (aq) + H^+ (aq)
I 1.79 0 0
C -x +x +x
E 1.79-x +x +x
Ka = [CH3CO2^-][H^+]/[CH3CO2H]
1.8*10^-5 = x*x/(1.79-x)
1.8*10^-5*(1.79-x) = x^2
x = 0.0056
[H^+] = 0.0056M
[OH^-] = KW/[H+]
= 1*10^-14/0.0056 = 1.78*10^-12M
[CH3CO2H] = 1.79-x = 1.79-0.0056 = 1.78M
part-F
CH3CO2H ------------------> CH3CO2^- (aq) + H^+ (aq)
I 0.0181 0 0
C -x +x +x
E 0.0181-x +x +x
Ka = [CH3CO2^-][H^+]/[CH3CO2H]
1.8*10^-5 = x*x/(0.0181-x)
1.8*10^-5*(0.0181-x) = x^2
x = 0.00056
[H^+] = 0.00056M
[OH^-] = KW/[H+]
= 1*10^-14/0.00056 = 1.78*10^-11M
[CH3CO2^-] = x = 0.00056M
[CH3Co2H] = 0.0181-x = 0.0181-0.00056 = 0.01754M