Reactions in aqueous solutions
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Reactions in aqueous solutions. Chapter 6 moving into chapter 7. Review. Two parts to a reaction reactants (what you start with) and products (what you make) In the middle is always a “ ” (yields sign), this separates the products and reactants. An example.

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Reactions in aqueous solutions

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Reactions in aqueous solutions

Reactions in aqueous solutions

Chapter 6 moving into chapter 7


Review

Review

  • Two parts to a reaction

  • reactants (what you start with) and products (what you make)

  • In the middle is always a “” (yields sign), this separates the products and reactants


An example

An example

  • Sodium and chlorine gas react to form table salt

  • 2 Na + Cl2 2 NaCl


Subscript letters

Subscript letters

  • The phase of substance is often denoted by subscript letters in parenthesis

  • solid –s, liquid-l, gas-g

  • 2 Na(s) + Cl2(g)2 NaCl(s)

  • Some ionic compounds tend to dissolve in water

  • Ions dissolved in water get the subscript- (aq)

  • it stands for aqueous (water-like)


Why it dissolves in water

Why it dissolves in water

Water is a polar molecule (meaning it has a positive and

negative side)

positive side

H

H

O

negative side

The positive side attaches itself to anions and the

negative side attaches to cations, water then

rips the ions away from each other, allowing the

ions to float freely in the water.


Dissociation equations

Dissociation Equations

  • dissociation- separating of ionic compounds into free ions in a solution

  • for NaCl in water

  • NaCl(s)  Na+(aq)+ Cl-(aq)

  • MgF2(s)  Mg2+(aq)+ 2 F-(aq)

  • Why did you need 2 in front of F?

  • Because there are two F’s on the reactant side


Where to draw that 2

Where to draw that 2

  • there is a difference between F2 and 2 F

  • F2 means the Fluorine molecules are bonded together

  • 2 F implies there are 2 fluorine atoms NOT bonded together floating around


Polyatomic ions

Polyatomic Ions

  • In this chapter we do NOT break apart polyatomic ions

  • Sodium hydrogen carbonate

  • Na+ HCO3-

  • NaHCO3→Na+(aq)+ HCO3-(aq)


Homework

Homework

  • give the formula and show the dissociation equation for:

  • cobalt (II) iodide

  • potassium sulfate


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