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Molarity of 3 Percent Hydrogen Peroxide
On the Quantitative Concentration of Substances with 3% Hydrogen Peroxide
Now we want to explore the quantitative concentration of substances with 3% hydrogen peroxide. Hydrogen peroxide, its chemical symbol is\ (H_ {2} O_ {2}\), which is a common chemical reagent.
Suppose that the 3% hydrogen peroxide solution in question has a solute mass fraction of 3%. Usually, the density of this solution is approximate to the density of water, that is,\ (\ rho\ approx1g/cm ^ {3}\).
Suppose that the hydrogen peroxide solution\ (100g\), then the mass of hydrogen peroxide\ (m_ {solute} = 100g\ times3\% = 3g\).
From the molar mass of hydrogen peroxide\ (M (H_ {2} O_ {2}) = (2\ times1 + 2\ times16) g/mol = 34g/mol\), the amount of hydrogen peroxide is\ (n =\ frac {m_ {solute}} {M} =\ frac {3g} {34g/mol}\ approx0.0882mol\).
Because the mass of the solution is\ (100g\) and the density is\ (1g/cm ^ {3}\), the solution volume\ (V =\ frac {m} {\ rho} =\ frac {100g} {1g/cm ^ {3}} = 100cm ^ {3} = 0.1L\).
According to the quantity concentration formula of the substance\ (c =\ frac {n} {V}\), the quantity concentration of the substance in a 3% hydrogen peroxide solution can be obtained\ (c =\ frac {0.0882mol} {0.1L} = 0.882mol/L\).
In summary, the concentration of 3% hydrogen peroxide is approximately\ (0.882mol/L\).
Now we want to explore the quantitative concentration of substances with 3% hydrogen peroxide. Hydrogen peroxide, its chemical symbol is\ (H_ {2} O_ {2}\), which is a common chemical reagent.
Suppose that the 3% hydrogen peroxide solution in question has a solute mass fraction of 3%. Usually, the density of this solution is approximate to the density of water, that is,\ (\ rho\ approx1g/cm ^ {3}\).
Suppose that the hydrogen peroxide solution\ (100g\), then the mass of hydrogen peroxide\ (m_ {solute} = 100g\ times3\% = 3g\).
From the molar mass of hydrogen peroxide\ (M (H_ {2} O_ {2}) = (2\ times1 + 2\ times16) g/mol = 34g/mol\), the amount of hydrogen peroxide is\ (n =\ frac {m_ {solute}} {M} =\ frac {3g} {34g/mol}\ approx0.0882mol\).
Because the mass of the solution is\ (100g\) and the density is\ (1g/cm ^ {3}\), the solution volume\ (V =\ frac {m} {\ rho} =\ frac {100g} {1g/cm ^ {3}} = 100cm ^ {3} = 0.1L\).
According to the quantity concentration formula of the substance\ (c =\ frac {n} {V}\), the quantity concentration of the substance in a 3% hydrogen peroxide solution can be obtained\ (c =\ frac {0.0882mol} {0.1L} = 0.882mol/L\).
In summary, the concentration of 3% hydrogen peroxide is approximately\ (0.882mol/L\).
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