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Reaction 1: chlorine reacts with cold aqueous sodium hydroxide to form solution Z - CIE - A-Level Chemistry - Question 17 - 2018 - Paper 1

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Reaction 1: chlorine reacts with cold aqueous sodium hydroxide to form solution Z. Reaction 2: solution Z is heated and forms ClO₃⁻(aq) and Cl⁻(aq). Which equati... show full transcript

Worked Solution & Example Answer:Reaction 1: chlorine reacts with cold aqueous sodium hydroxide to form solution Z - CIE - A-Level Chemistry - Question 17 - 2018 - Paper 1

Step 1

reaction 1: chlorine reacts with cold aqueous sodium hydroxide to form solution Z

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Answer

The first reaction involves chlorine ( ext{Cl}_2) reacting with cold aqueous sodium hydroxide (NaOH) to produce sodium hypochlorite ( ext{ClO}^-) and sodium chloride ( ext{NaCl}) as well as water (H₂O). This can be represented by the balanced equation:

2extCl2+2extOH−→2extClO−+extCl−+2extH2extO2 ext{Cl}_2 + 2 ext{OH}^- \rightarrow 2 ext{ClO}^- + ext{Cl}^- + 2 ext{H}_2 ext{O}

Step 2

reaction 2: solution Z is heated and forms ClO₃⁻(aq) and Cl⁻(aq)

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Answer

In the second reaction, solution Z (which contains hypochlorite) is heated to produce chlorate ( ext{ClO}_3^-) and chloride ions ( ext{Cl}^-). The equation representing this reaction can be written as:

3extClO−→extClO3−+2extCl−3 ext{ClO}^- \rightarrow ext{ClO}_3^- + 2 ext{Cl}^-

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