In a 0.738 m solution, a weak acid is 12.5% dissociated. calculate ka of the acid.

Ka == 1.153 × 10^-4

Weak acid is HA;

Equilibrium: HA(aq) + H2O(l) <=> H3O^+(aq) + A^-(aq)

Ka = [H3O^+][A^-]/[HA]  

[H3O^+] = [A^-] = (0.0125)(0.738)

                         = 0.00923 M and [HA]

                         = 0.738 M - 0.00923 M = 0.738 M because the value 0.00923  is insignificant in this case.  

Ka = (0.00923)^2/(0.738)

     = 1.153 × 10^-4

if two electrons have the same n, the same ℓ, and the same ml, then they are in the same orbital. the pauli exclusion principle states that no two identical fermions (a fancy word for electrons and other subatomic particles like electrons) may occupy the same quantum state in an atom simultaneously.

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.