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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: Find molarity rates assured
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[Post New]18 Dec 2007 23:01:53 IST
    Subject: Find molarity rates assured
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rakesh61 (1898)

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A current 9.65 A is passed for 3 hrs between nickel electrodes in 0.5 L of a 2 M  solution of Ni(NO3)2  
 
The molarity of the solution after the electrolysis would be
 
0.92M
 
Please give detailed solution rates assured for satisfactory ans
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[Post New]18 Dec 2007 23:14:42 IST
    Subject: Find molarity rates assured
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pannaguma (425)

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Ni at.wt = 58.7
thus mol wt of Ni(NO3)2 = 241.4
eq wt = 120.7 [since 2 electron lost/gained]

w=ZIT = eq.wt *IT/96500=130gms
ie = 0.54 moles

initially 1mole
finally 0.46moles

thus final molarity = 0.46/0.5 = 0.92M

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