For the following reaction between Mohr\'s salt (iron as FeSO4(NH4)2SO46H2O) and

Question

For the following reaction between Mohr's salt (iron as FeSO4(NH4)2SO46H2O) and potassium dichromate (dichromate as K2Cr2O7), determine the volume (in milliliters) of a 0.110 M solution of Mohr's salt that is needed to fully react with 0.0700 L of 0.170 M potassium dichromate. (The reaction is shown in its ionic form in the presence of a strong acid.)

For the same reaction, what volume (in milliliters) of 0.170 M potassium dichromate is required to fully react with 0.0700 L of a 0.170 M solution of Mohr's salt?  

Explanation / Answer

Cr2O72- + 6Fe2+ + 14H+ -------> 2Cr3+ + 6Fe3+ +7H2O

    potassium dichromate                                                Mohr's salt

M1 = 0.17M M2 = 0.17M

V1 =    V2 = 0.07L =     70ml

   n1 = 1    n2 = 6

   M1V1/n1 =    M2V2/n2

   V1    = M2V2n1/n2M1

= 0.17*70*1/6*0.17

                              = 11.66ml >>>>answer

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