Question
Sun January 30, 2011 By: Doctor Srishty
 

volume strength of 1.5 N H2O2 solution is?and how plz give proper explanation

Expert Reply
Sat February 05, 2011
Volume strength (or volume percent) is an outdated term referring to the volume of oxygen gas liberated from one volume of H2O2 solution (at 0oC and 1 atm.).
For example: If the volume strength is given as 20-volumes, it means that 1cm3 of H2O2 will produce 20cm3 of oxygen gas.

2 H2O2   -----> 2 H2O  +  O2 

2 moles of H2O2  ------->    22.4 L oxygen at STP .

Now

It is given that Normality of H2O2 = 1.5 N

Moilarity of H2O2 = 0.75 M ( n-factor for H2O2 = 2 and N= nM) 

So, in 1 L H2O2 solution , there are 0.75 moles of H2O2

2 moles  of H2O2  give  22.4 L O2 at STP 

So, 0.75 moles (1 L of the given H2O2 soln) will give (22.4*0.75 / 2  ) L of Oxygen

Volume strength = 0.75*22.4 / 2 = 0.75*11.2  = 8.4 L

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