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6.3 Electrolysing brine

05 June 2014. 6.3 Electrolysing brine. Brine is salty water. It’s chemical name is sodium chloride, NaCl aq . Both elements are useful in thousands of products. 05 June 2014. 6.3 Electrolysing brine. Brine can be electrolysed into Sodium Hydroxide (NaOH) Chlorine (Cl) Hydrogen (H 2 ).

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6.3 Electrolysing brine

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  1. 05 June 2014 6.3 Electrolysing brine Brine is salty water. It’s chemical name is sodium chloride, NaClaq. Both elements are useful in thousands of products.

  2. 05 June 2014 6.3 Electrolysing brine • Brine can be electrolysed into • Sodium Hydroxide (NaOH) • Chlorine (Cl) • Hydrogen (H2). • Some of the uses of the products of the electrolysis of brine are; • Soap (NaOH) • PVC (Cl) • Bleach (NaOH + Cl) • Margerine (H2)

  3. What type of ion does chlorine form? What type of ion for hydrogen? Diaphragm cell Sodium is more reactive than Hydrogen so does not gather at the cathode.

  4. Wear Eye Protection. Caution: Sodium Hydroxide Chlorine 6V Beaker with saturated brine and Universal Indicator Practical Method Diagram • Set up the apparatus as shown. • Write down your observations as shown below. Results

  5. Questions • Name the gas given off at each electrode. • What are the four ions present in the brine? • Which ions remain in the solution? • What compound would they form?

  6. Answers • Name the gas given off at each electrode. • Anode = Chlorine, Cathode = Hydrogen • What are the four ions present in the brine? • Sodium+, Chloride-, Oxide2-, Hydrogen+ • Which ions remain in the solution? • Sodium+, Oxide2-, Hydrogen+ • What compound would they form? • Sodium Hydroxide (NaOH)

  7. Uses of electrolysed brine Brine produces 3 main products. Which products are used for; NaOH H2 Cl • Margarine • PVC • Bleach • Soap • Paper • Rayon fibres • Detergents • Purification of aluminium ore • Hydrochloric acid manufacture

  8. Uses of electrolysed brine • Margarine [hydrogen] • PVC [chlorine] • Bleach [sodium hydroxide, chlorine] • Soap [sodium hydroxide] • Paper [chlorine] • Rayon fibres [sodium hydroxide] • Detergents [sodium hydroxide, chlorine] • Purification of aluminium ore [sodium hydroxide] • Hydrochloric acid manufacture [chlorine, hydrogen]

  9. 05 June 2014 6.3 Electrolysing brine • Brine can be electrolysed into • Sodium Hydroxide (NaOH) • Chlorine (Cl) • Hydrogen (H2). • Some of the uses of the products of the electrolysis of brine are; • Soap (NaOH) • PVC (Cl) • Bleach (NaOH + Cl) • Margerine (H2)

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