The normality of 10 volume H2O2 is nearly?

A) 2.1

B) 3.4

C) 1.7

D) 5.1

To determine the normality of a 10 volume hydrogen peroxide (H2O2) solution, we first need to understand what "volume" means in this context. The term "10 volume" refers to the amount of oxygen gas that can be released from one volume of the hydrogen peroxide solution when it decomposes. Specifically, 1 volume of H2O2 can release 10 volumes of oxygen gas. This is a key point in calculating normality.

Understanding Normality

Normality (N) is a measure of concentration equivalent to molarity but specifically relates to the reactive capacity of a solution. For hydrogen peroxide, which can act as an oxidizing agent, we need to consider how many equivalents of H2O2 are present in the solution.

Calculating Molarity from Volume

First, let’s convert the 10 volume of H2O2 into molarity. The decomposition of hydrogen peroxide can be represented by the following reaction:

• 2 H2O2 → 2 H2O + O2

This reaction shows that 2 moles of H2O2 produce 1 mole of O2. Therefore, for a 10 volume solution, we can infer that:

• 10 volumes of O2 corresponds to 5 volumes of H2O2.

Since 1 volume of H2O2 corresponds to approximately 0.1 moles (based on the molar volume of gas at standard conditions), we can calculate the molarity:

• 5 volumes of H2O2 = 5 x 0.1 moles = 0.5 moles of H2O2.

Determining Normality

Next, we need to find the normality. For H2O2, which can donate 2 equivalents of electrons in redox reactions, the normality is twice the molarity:

• Normality (N) = 2 x Molarity (M)
• N = 2 x 0.5 = 1.0 N

However, since we are looking for the normality of a 10 volume solution, we need to consider that the typical concentration of 10 volume H2O2 is around 3% w/v. This concentration corresponds to a normality of approximately 1.7 N when calculated based on the equivalents of H2O2 available for reactions.

Final Answer

Thus, the normality of a 10 volume H2O2 solution is nearly 1.7 N, which corresponds to option C. This reflects the concentration of reactive species in the solution and is crucial for applications in chemistry and biology where precise measurements are necessary.