For the following reaction between Mohrs salt (iron as FeSO4(NH4)2S04 6H20) and

Question

For the following reaction between Mohrs salt (iron as FeSO4(NH4)2S04 6H20) and potassium dichromate (dichromate as K2Cr207), determine the volume (in milliliters) of a 0.200 M solution of Mohr's salt that is needed to fully react with 0.0700 L of 0.200 M potassium dichromate. (The reaction is shown in its ionic form in the presence of a strong acid.) 2 + Number Mohr's salt volume mL For the same reaction, what volume (in milliliters) of 0.200 M potassium dichromate is required to fully react with 0.0700 L of a 0.200 M solution of Mohr's salt? Number potassium dichromate volume mL

Explanation / Answer

Ans 1 :

using the formula M1 V1 / n1 = M2 V2 / n2

where M is molarity , V is volume and n is number of moles

Putting all the values we get :

(0.200 x V) / 6 = 0.200 x 0.0700

V = 0.42 L

1 L = 1000 mL

0.42 L = 0.42 x 1000

= 420 mL

Ans 2 :

Using the same formula again , we get :

0.200 x V = (0.200 x 0.0700) / 6

V = 0.0117 L

1 L = 1000 mL

So 0.0117 L = 0.0117 x 1000

= 11.7 mL

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