An antiseptic solution contains hydrogen peroxide (H2O2\text{H}_2\text{O}_2H2O2) as its active agent. A chemist wants to determine the percentage by mass of H2O2\text{H}_2\text{O}_2H2O2 in a commercial brand of this antiseptic.
She uses the following method:
The table below shows her experimental results:
| Measurement | Value |
|---|---|
| Mass of antiseptic sample | 1.36 g1.36\text{ g}1.36 g |
| Concentration of KMnO4\text{KMnO}_4KMnO4 solution | 0.0240 mol/dm30.0240\text{ mol/dm}^30.0240 mol/dm3 |
| Volume of KMnO4\text{KMnO}_4KMnO4 solution added | 20.00 cm320.00\text{ cm}^320.00 cm3 |
Calculate the amount, in moles, of KMnO4\text{KMnO}_4KMnO4 in 20.00 cm320.00\text{ cm}^320.00 cm3 of 0.0240 mol/dm30.0240\text{ mol/dm}^30.0240 mol/dm3 potassium permanganate solution.
In the titration, 2 mol2\text{ mol}2 mol of KMnO4\text{KMnO}_4KMnO4 reacts with 5 mol5\text{ mol}5 mol of H2O2\text{H}_2\text{O}_2H2O2. Calculate the amount, in moles, of H2O2\text{H}_2\text{O}_2H2O2 in the antiseptic sample.
Calculate the mass, in grams, of H2O2\text{H}_2\text{O}_2H2O2 in the antiseptic sample. [Mr of H2O2=34.0M_{\text{r}}\text{ of H}_2\text{O}_2 = 34.0Mr of H2O2=34.0]
Calculate the percentage by mass of H2O2\text{H}_2\text{O}_2H2O2 in the antiseptic sample.
