Hey!

The equivalent weight of base : is the weight of compound that contains one equivalent of hydroxide ion (OH-) .

Formula for calculating equivalent weight of base = molecular weight / acidity of base

For Ca(OH)2 : acidity is two as it can donate two OH- ions

It's equivalent weight is =

molecular weight /2

= (40+16*2+1*2)/2

=74/2

=37

For NaOH acidity is 1 as it can donate one OH- ion

It's equivalent weight = molecular weight/acidity

= (23+16+1)/1

=40

Hope it helped to clear your delimma

Thank you