Question

how to find formal charge from formula , like find the formal charge on S in HSO4^-

Answer 1

The overall charge on HSO4- is -1

H has a charge of +1
O has a charge of -2
With 4 atoms of O total charge is = 4 X (-2) = -8

Charge on H + charge on S + charge on O = -1
or 1 X (+1) + 1 X charge on S + ​4 X (-2) = -1
or +1 + charge on S -8 = -1
or charge on S -7 = -1
charge on S = 7-1 = +6