1.1. Household bleach contains NaClO as its active ingredient.

NaClO can be produced from the reaction between chlorine and aqueous sodium hydroxide.

i) State the conditions required for NaClO to be produced from this reaction.

[1]

ii) State the systematic name of NaClO.

[1]

iii) When chlorine and sodium hydroxide react under different conditions, sodium chlorate(V) is produced. Deduce the formula of sodium chlorate(V).

[1]

1.2. The balanced symbol equation showing the reaction of chlorine and sodium hydroxide to form NaClO is shown below.

Cl₂ (aq) + 2NaOH (aq) → NaClO (aq) + NaCl (aq) + H₂O (l)

i) Construct an ionic equation for this reaction.

[1]

ii) Explain, in terms of changes in oxidation numbers, why this is an example of a disproportionation reaction.

[2]

1.3. The concentration of NaClO in bleach can be found by reacting it with hydrogen peroxide, H₂O₂.

NaClO (aq) + H₂O₂ (aq) → NaCl (aq) + O₂ (g) + H₂O (l)

Explain, using oxidation numbers, why chlorine has been reduced in this reaction.

1.4. A student reacted an excess of aqueous hydrogen peroxide with 10.0 cm³ of a sample of bleach. They collected 108 cm³ of oxygen gas. Assume that under the conditions used, the molar gas volume is 24.0 dm³ mol^-1.

Calculate the concentration of NaClO in the bleach, in g per 100 cm³. Show your working.

concentration of NaClO = ................................. g per 100 cm³