Ph of mixture of strong acid and weak acid
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Chemical thermodynamics is easy in that it always has enough equations to derive all the variables involved, and guarantees to produce a unique solution. The derivation itself may be not that easy, but that's another story.
In short, we have some weak acid HAHAand the products of its dissociation. Mind you, H+HX+ comes also from the strong acid, which dissociates completely. Now, the equations:
[HA]+[A−]=C1[H+]=[A−]+C2[H+][A−][HA]=Ka[HA]+[AX−]=C1[HX+]=[AX−]+C2[HX+][AX−][HA]=Ka
Is the rest clear?
In short, we have some weak acid HAHAand the products of its dissociation. Mind you, H+HX+ comes also from the strong acid, which dissociates completely. Now, the equations:
[HA]+[A−]=C1[H+]=[A−]+C2[H+][A−][HA]=Ka[HA]+[AX−]=C1[HX+]=[AX−]+C2[HX+][AX−][HA]=Ka
Is the rest clear?
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