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Don't involve pH here , this way it's easy :
Look bases dissociate to give OH ions in water right .. Now who will be a weak base ?? The one which will not give OH ion easily or slowly.
This means compound must have a strong LATTICE. Look at charges Na, NH4 and K have +1 charge Ca have +2 charge after dissociation . Greater charge Stronger lattice , so Na and K are out of race . We are now left with Ca . So Ca(OH)2 have strongest lattice - dissociates least - making it aweak base .
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