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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-
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
Which space is the most abundant in 1-0 M of wak acid HCN solution- As.docx

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Which space is the most abundant in 1-0 M of wak acid HCN solution- As.docx

  • 1. 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- 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