For the following reaction between Mohr\'s salt (iron as FeSO_4(NH_4)_2SO_4 6H_2
ID: 921512 • Letter: F
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_2Cr_2O_7), determine the volume (in milliliters) of a 0.230 M solution of Mohr's salt that is needed to fully react with 0.0500 L of 0.230 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+ + 6Fe^3+ + 7H_2O Mohr's salt volume = mL For the same reaction, what volume (in milliliters) of 0.230 M potassium dichromate is required to fully react with 0.0500 L of a 0.230 M solution of Mohr's salt potassium dichromate volume = mLExplanation / Answer
from equation 1 mol K2Cr2o7 = 6 MOL Fe2+
No of mol of K2Cr2o7 = 0.05*0.23 = 0.0115 mol.
No of mol of mohrssalt reacted = 0.0115*6 = 0.069 mol.
volume of mohrssalt reacted = 0.069/0.23 = 0.3 L
= 300 ml
No of mol of K2Cr2o7 = 0.0115/6 = 0.00192 mol.
No of mol of mohrssalt reacted = 0.05*0.23 = 0.0115 mol.
volume of K2Cr2O7 = 0.00192/0.23 = 0.00835 L
= 8.35 ml
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