Which space is the most abundant in 1.0 M of wak acid HCN solution? Assume that...

Which space is the most abundant in 1.0 M of wak acid HCN solution? Assume that Ka for HCN IS 10^-10. A) HCN B) H+ C) CN- D) OH-

Expert Solution

HCN(aq) ----------> H^+ (aq) + CN^- (aq)

I 1 0 0

C -x +x +x

E 1-x +x +x

Ka = [H^+][CN^-]/[HCN]

10^-10 = x*x/1-x

10^-10 *(1-x) = x^2

x = 1*10^-6

[H^+] = x = 1*10^-6M

[CN^-] = x = 1*10^-6M

[HCN] = 1-x = 1-0.000001 = 0.99M

[OH^-] = Kw/[H^+]

= 1*10^-14/10^-6 = 10^-8 M

HCN is the most abundant

A) HCN >>>>answer

queen_honey_blossom answered 2 years ago

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