1.15 . The amount of dissolved ions in a solution is expressed using the unit eq

Question

1.15 . The amount of dissolved ions in a solution is expressed using the unit equivalent (Eq) of the ion. A unit equivalent of an ion relates the charge present on the ion to the number of moles of the ions present in the solution. For example, one mole of Na+ ions will have one equivalent of charge because the charge on a sodium ion is 1+. However, a Ba2+ ion will have two equivalents of charge because the charge on a barium ion is 2+

A sample solution containing sulfate ions (SO42) was analyzed and was found to contain 2.5 mol of sulfate ions (SO42).

1) Calculate the equivalent of sulfate ions (SO42) present in the solution.

Explanation / Answer

If n = 2.5 mol

also, charg e= +2/-2

then

equivalence = eq*n = 2*2.5 = 5 equivalents

equivalent SO4-2 in solution is 5

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