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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Although there are a number of magnesium-containing minerals, the commercial source of this metal is seawater. Treatment of seawater with Ca(OH)2 gives insoluble Mg(OH)2. This reacts with HCI to produce MgCl2, which is dried, and the metal is obtained by electrolysis of the molten salt. Write balanced net ionic equations for the three reactions described here.

Interpretation Introduction

Interpretation:

The balanced net ionic equation for the given reactions should be written.

Concept introduction:

  • For chemical reaction balanced chemical reaction equation written in accordance with the Law of conservation of mass.
  • Net ionic equation only shows the net reaction that occurred after the completion of that particular reaction and. It does not indicate all the reactions that have happened in the corresponding system.
  • Law of conservation of mass states that for a reaction total mass of the reactant and product must be equal.
  • Stoichiometric factor is a relationship between reactant and product which is obtained from the balanced chemical equation for a particular reaction.
  • Electrolysis is a chemical decomposition produced by passing an electric current through a liquid or solution contains ion.
Explanation

Given,

Treatment of sea water with Ca(OH)2 gives insoluble Mg(OH)2. This reacts with HCl to produce MgCl2, which is then dried, and the metal (Mg ) is obtained by electrolysis of the molten salt.

Thus,

The sea water which contains magnesium ions and this ion is reacts with Ca(OH)2 gives the insoluble Mg(OH)2 along with Ca2+ion

Mg(OH)2 when reacts with aqueous hydrochloric acid, MgCl2 will produced in good yield. After the electrolysis of the molten salt of MgCl2, magnesium metal (Mg ) can be isolated

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