What Value LE: Ch8 ing Jump to 7 11:00 PM s.4/10 pling Learning ron content of t

Question

What Value LE: Ch8 ing Jump to 7 11:00 PM s.4/10 pling Learning ron content of the well water on the new property you are about to buy. You 4 M. You treat 120 mL of prepare a reference standard Feo. souson with a concentration of 803 × 10 this reference with HNO, and excess KSCN to form a red complex, and dilute the reference to 50.0 mL. The diluted reference is placed in a r cell with a 1.00-cm light path. You then take 10.0 mL of the wel water, treat with HNOs and excess KSCN, and dilute to 100 0 m.. This diluted sample is placed in a variable ce of the reference and the sa tions match when the The absorban For each solution, the zero is patrwengn is 3 89 cm. What is the concentration f iron in the we set with a blank. 0 0

Explanation / Answer

Cref = 8.03 x 10^-4 x 12 / 50

       = 1.93 x 10^-4 M

A = e b C

Csample = C ref x b ref / b sample

               = 1.93 x 10^-4 x 1 / 3.89

               = 4.954 x 10^-5 M

[ Fe+3 ]well water = 4.954 x 10^-5 x 100 / 10

                                = 4.95 x 10^-4 M

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