For the following reaction between Mohr\'s salt (iron as FeSO_4(NH_4)_2SO_4 6H_2

Question

For the following reaction between Mohr's salt (iron as FeSO_4(NH_4)_2SO_4 6H_2O) and potassium dichromate (dichromate as K_2O_2O_7), determine the volume (in milliliters) of a 0.220 M solution of Mohr's salt that is needed to fully react with 0.0700 L of 0.220 M potassium dichromate. (The reaction is shown in its ionic form in the presence of a strong acid.) Cr_2O_7^2- + 6Fe^2+ + 14H^+ rightarrow 2Cr^3+ + 6Fc^3+ + 7H_2O Mohr's salt volume = For the same reaction, what volume (in milliliters) of 0.220 M potassium dichromate is required to fully react with 0.0700 L of a 0.220 M solution of Mohr's salt? potassium dichromate volume =

Explanation / Answer

from this reaction it is clear that for one mole of Cr3O7 required 6 moles of mohrs salt

both concentrations are same so

6 x 0.07 L

= 0.42L

= 0.42 x 1000

= 420 mL

2)

0.07/6

= 0.01167 L

= 0.01167 x 1000

= 11.67mL

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