Consider an electrochemical cell based on the spontaneous reaction 2AgCl(s) + Zn(s) → 2Ag(s) + 2Cl– + Zn2+. If the zinc ion concentration is kept constant at 1 M, and the chlorine ion concentration is decreased from 1 M to 0.001 M, the cell voltage should:

there is an increase by 0.18 V in the cell voltage.

Explanation:

The given equation of the reaction can be well written as

By application of Nernst Equation ; we have the expression

here in the above equation;

n = number of electrons transferred in the equation of the reaction

n = 2

Also;

If the zinc ion concentration is kept constant at 1 M; we have:

Since log(1) = 0

Therefore;

When the chlorine ion concentration is decreased from 1 M to 0.001 M; we have;

The change in voltage =

=( 1.737 - 1.56 )V

= 0.177 V

≅ 0.18 V

Thus; from the following observation; there is an increase by 0.18 V in the cell voltage.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.