Would be activity of Cl- be greater or less in seawater than in water from the...

Would be activity of Cl- be greater or less in seawater than in water from the Mississippi River? Answer the same question for the activity coefficient. Explain your answers!!!

Solutions

Expert Solution

Activity of sea water is less than activity of mississippi river

Activity coefficient of sea water is less than activity coefficient of mississippi river

Explanation

Ionic strength of sea water is high due to more dissolved soilids

Ionic strength, I calculated as follows

I = 1/2 ( c1×z2² + c2×z2² + c3×z3²+.....)

where,

c1, c2, c3 etc are concentration of ions 1,2,3 etc

z1, z2, z3 etc are charges of ions 1,2,3etc

ionic strength and activity coefficient, , are related as follows

log1= - 0.51×z1²× √I/(1+3.3 × × √I )

Where, is diameter of hydhydrated ion

thus activity coefficient is decreasing when ionic strength is increasing

activity,a, formula is

a = c

where , c is concentration

So, activity is decreasing when activity activity coefficient decreasing

therefore,

Due to high ionic strength of sea water, activity and activity coefficient is less for sea water than for Mississippi river.

queen_honey_blossom answered 1 year ago

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