Equivalent weights of `Na_(2)CO_(3)` and `Al_(2)(SO_(4))_(3)`

Explanation

`Na_(2)CO_(3)2Na^(+1)+CO_(3)^(-2)`
Equivalent weight of `Na_(2)CO_(3)=(106)/(2)=53`
`Al_(2)(SO_(4))_(3)rarr 2Al^(+3)+3SO_(4)^(-2)`
Equivalent weight of `Al_(2)(SO_(4))_(3)=(342)/(6)=57`