After mixing together: B + C = BC
volume is 70 ml
mole of BC is 0.00500
molea of B and C are equal 0.035*1 - 0.005 = 0.030
concentrations are [BC] = 0.005/0.070 = 0.0714 M,
[B] = [C] = 0.030/0.070 = 0.4286 M
Equilibrium constant is
K = [BC]/([B]*[C]) = 0.3887
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