Question

When KCl dissolves in water

Multiple Choice

A. the Cl- ions are attracted to the partially negative oxygen atoms of the water molecules

B. the K+ ions are attracted to the partially negative oxygen atoms of the water molecules

C. the K+ ions are attracted to the partially positive hydrogen atoms of the water molecules.

D. the Cl- ions are attracted to dissolved K+ ions

Answer 1

As we know that, KCI is a strong electrolyte and an ionic compound also. It contains strong electrostatic attraction between K* and Cl. Further water (H2O) is a polar molecule which will have the dipole interaction. When KCl dissolves into the water then there will be ion-dipole interaction between KCl and water molecule which helps to dissociate KCl into the water molecule.

Since, oxygen has partial negative charge and hydrogen has partial positive charge. So, K+ will be attracted by the partial negative charged oxygen atom and Cl" will be attracted by the partial positive charged hydrogen atom. So, the correct option will be (B) the K+ ions are attracted to the partially negative oxygen atoms of the water molecules.