The strength of a H2O2 solution is 20 volume, i.e. 1 mL of the solution gives 20 mL of O2 at STP on decomposition (2H2O2 -> 2H2O + O2; molar volume 22.4 L at STP). Its normality as an oxidant or reductant (n=2) is:

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The strength of a $H X_{2} O X_{2}$ solution is $20$ volume, i.e. $1 mL$ of the solution gives $20 mL$ of $O X_{2}$ at STP on decomposition ( $2 H X_{2} O X_{2} 2 H X_{2} O + O X_{2}$ ; molar volume $22.4 L$ at STP). Its normality as an oxidant or reductant ( $n = 2$ ) is:

1 L

gives

20 L

O X_{2} = 20/22.4 = 0.893

mol, and

2

mol

H X_{2} O X_{2}

are used per mol

O X_{2}

, so

[H X_{2} O X_{2}] = 1.786 M

. With

n = 2

N = 3.57 N

(equivalently

20/5.6