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Determine the molar concentration of cl- ions in a 1. 00 m solution of agcl2- with no excess silver ions

Sagot :

The molar concentration of Cl⁻ ions in a 1. 00 m solution of AgCl₂ with no excess silver ions is 0.020M.

How do we determine the molar concentration?

Molar concentration of Chloride ions present in the silver chloride solution will be calculated by using the formation constant equation as:

Kf = [AgCl₂] / [Ag²⁺][Cl⁻]²

For AgCl₂ value of Kf is 2.5×10⁵.

Chemical reaction with ICE table is:

                           Ag²⁺(aq)  +  2Cl⁻(aq)  →  AgCl₂

Initial:                         0               0                1

Change:                    +x             +2x             -x

Equilibrium:               x                2x             1-x

On putting all the values on the Kf equation, we get

2.5×10⁵ = (1-x) / (x)(2x)²

x is negligible as compared to 1 so the term 1-x becomes 1,

2.5×10⁵ = 1 / 4x³

x = 9.97 × 10⁻³ M

Concentration of chloride ions = 2x = 2(9.97 × 10⁻³) = 0.020M.

Hence the molar concentration of chloride ions is 0.020M.

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