for this question (never mind) find Ka:
just rember never is negative and mind is posetive then we will have:
never mind<=====> (never-) + (mind+) (1)
Ka= [never-][mind+]/[never mind]
ka is different from person to person its deponds to the condition of equilubrum, like mood, knowladge and but in general for good student ka is big because they diassociate "never mind" because they are posetive and don't use "never" a lot and visa versa.
know you can use "Le chatelier" principal for equilubrum (1):
if you add common Ion (never-) to your solution the equilubrum will shift to the left( never mind) because in the right side of reaction (never-) is increasing, equilubrum will decrease the negative ion(never-) with binding to (mind+) and shift to the left. that means you are going to loose you posetive ion (mind+) too.
result: try not to use never-( negative) a lot.
hopefuly you got your answer.🙂