how to prepare 50 % saturated solution of KIO3 in water ?

Answer 1

Look up the solubility of KIO3.

I find a value of 9.16 g/100 mL (25 °C).

Thus, a 50% (m/v) solution would contain 1/2 of this amount, i.e. 4.58 g/100 ml @ 25ºC