Which of the following species are/is present at the highest concentration in a 1.0 mol/L aqueous...
Which of the following species are/is present at the highest concentration in a 1.0 mol/L aqueous HCN solution?
a) CN- b) H3O+ c) HCN d) OH- e) a) and b) are present at the same concentration, which is greater than that of the other listed species.
Homework Answers
HCN(aq) +H2O----> H3O^+ (aq) + CN^- (aq)
I 1 0 0
C -x +x +x
E 1-x +x +x
ka = [H^+][CN^-]/[HCN]
6.2*10^-10 = x*x/(1-x)
6.2*10^-10*(1-x) = x^2
x = 2.5*10^-5
[H3O^+] = x = 2.5*10^-5 M
[CN^-] = x = 2.5*10^-5 M
[HCN] = 1-x = 1-2.5*10^-5 = 0.999975M has highest concentration
[OH^-] = Kw/[H3O^+]
= 1*10^-14/(2.5*10^-5) = 4*10^-10 M
c) HCN >>>>answer
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