Question

1. the grams of water that must be added to 4.00 g KI in the preparation of 2.00 % KI solution.

Answer 1

Let the mass of solvent be x.

$Percentage\space concentration=2=\frac{2}{x+2}×100$ $2x+4=200\space \space \space x=\frac{200-4}{2}=98grams$