Ionic Equations....
This presentation is the property of its rightful owner.
Sponsored Links
1 / 32

Ionic Equations.... PowerPoint PPT Presentation


  • 68 Views
  • Uploaded on
  • Presentation posted in: General

Ionic Equations. What’s really swimming around. And what’s not swimming around. Electrolytes: cmpds whose aqueous solutions conduct electricity. (refer to solubility rules). Electrolytic solutions must contain ions. Nonelectrolytes: cmpds whose solutions don’t conduct

Download Presentation

Ionic Equations....

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Ionic equations

Ionic Equations....

What’s really swimming around.

And what’s not swimming around.


Ionic equations

Electrolytes: cmpds whose aqueous solutions conduct electricity. (refer to solubility rules). Electrolytic solutions must contain ions.

Nonelectrolytes: cmpds whose solutions don’t conduct

electricity. No ions are present in solution.

For a RXN to occur, at least one product must a non-electrolyte.

An insoluble solid (s) or a molecular substance such as a gas (g), or liquid (l) [as in H2O(l)]

If everything remains aqueous (aq), no reaction occurs. All particles are ions and are spectators.


Double replacement reactions

Double Replacement Reactions

Or to impress your friends.

Also called:

Metathesis reactions


Ionic equations

KI(aq) + Pb(NO3)2(aq)  KNO3(aq) + PbI2(s)


Ionic equations

Equation:

2KI(aq) + Pb(NO3)2(aq)2KNO3(aq) + PbI2(s)

Overall Ionic Equation:

Beaker B

2K++ 2NO3-

Beaker C

Beaker A

2K+ + 2I-

+ Pb2+ + 2NO3-

+ PbI2(s)


Ionic equations

Equation:

2KI(aq) + Pb(NO3)2(aq)2KNO3(aq) + PbI2(s)

Overall Ionic Equation:

2K++ 2NO3-

2K+ + 2I-

+ Pb2+ + 2NO3-

+ PbI2(s)

Net Ionic Equation: (Cross out the spectator ions)

+ 2I-

Pb2+

PbI2(s)

These are the ions that form the product


Ionic equations

All group 1 cmpds are soluble!


Ionic equations

Let’s Take a Quiz!!

Which one of the following substances is insoluble in water?

a) RbOH

b) KSCN

c) BaCO3

d) LiBr

e) Na3PO4

What do these cmpds look like when they dissolve?


Ionic equations

What do these cmpds look like when they dissolve?

Which one of the following substances is insoluble in water?

a) RbOH

b) KSCN

c) BaCO3

d) LiBr

e) Na3PO4

H2O


Ionic equations

Which one of the following is an insoluble base?

a) RbOH

b) Ba(OH)2

c) Al(OH)3

d) LiOH

e) KOH


Ionic equations

Which one of the following salts is insoluble in water?

a) FeCl3

b) Al2(SO4)3

c) Cr(NO3)3

d) (NH4)2CO3

e) AgCl


Ionic equations

Which one of the following salts is insoluble in water?

a) MgSO4

b) KNO3

c) AgBr

d) FeCl3

e) NaBr


Ionic equations

What is the total ionic equation for the following formula unit equation?

BaCl2(aq) + Na2SO4(aq) --> BaSO4(s) + 2NaCl(aq)

[Ba2+(aq)+2Cl-(aq)] + [2Na+(aq)+SO42-(aq)] 

BaSO4(s) + 2Na+(aq)+2Cl-(aq)

Let’s find the net ionic equation:

(Cross out all the Spectator ions.)

Net ionic equation:

Ba2+ + SO42- BaSO4(s)


Ionic equations

Common Strong Acids and Bases:

Strong acids are completely separated into their ions in water.

Strong bases are strong electrolyes also. (high solubility)

Strong Acids:

Chloric, HClO3

Hydrobromic, HBr

Hydrochloric, HCl

Hydroiodic, HI

Nitric, HNO3

Sulfuric, H2SO4

Perchloric HClO4

Strong Bases:

Group 1A metal hydroxides

(LiOH, NaOH, KOH,

RbOH, CsOH)

Heavy Group 2A metal hydroxides

[Ca(OH)2, Sr(OH)2, and

Ba(OH)2]


Ionic equations

What is a strong Acid?

An Acid that is 100% ionized in water.

Strong Acids:

100% ionized (completely dissociated) in water.

HCl + H2O  H3O+ + Cl-

often written as:

HCl  H+ + Cl-


Ionic equations

What is a strong Base?

A base that is completely dissociated in water (highly soluble).

NaOH(s)  Na+ + OH-

Strong Bases:

Group 1A metal hydroxides

(LiOH, NaOH, KOH,

RbOH, CsOH)

Heavy Group 2A metal hydroxides

[Ca(OH)2, Sr(OH)2, and

Ba(OH)2]


Ionic equations

RXN: Strong acid and a strong base.

HCl(aq) + NaOH(aq) HOH(l) + NaCl(aq)

nonelectrolyte

electrolyte

strong

strong

Na+ + Cl-

H2O(l) +

Na+ + OH-

H+ + Cl- +

“this is the total or overall ionic equation”

H+ + OH- H2O(l)

Cross out the spectators to find the

NET IONIC EQUATION


Ionic equations

Strong and Weak acids

Strong Acids:

HClO4 H2SO4

HNO3 HI

HBrHCl

HClO3

Weak Acids:

“The Rest”

Weak electrolytes

Strong electrolytes


Ionic equations

Strong Acids:

100% ionized (completely dissociated) in water.

HCl + H2O  H3O+ + Cl-

Note the “one way arrow”.

Weak Acids:

Only a small % (dissociated) in water.

HC2H3O2 + H2O H3O+ + C2H3O2-

Note the “2-way” arrow.

Why are they different?


Ionic equations

Strong Acids:

HCl HCl

HCl

HCl

HCl

(H2O)

ADD WATER to MOLECULAR ACID


Ionic equations

Strong Acids:

Cl-

H3O+

(H2O)

Cl-

H3O+

H3O+

Cl-

Cl-

H3O+

H3O+

Cl-

Note: No HCl molecules remain in solution, all have been ionized in water.


Ionic equations

Weak Acid Ionization:

HC2H3O2

HC2H3O2

(H2O)

HC2H3O2

HC2H3O2

HC2H3O2

Add water to MOLECULES of WEAK Acid


Ionic equations

Weak Acid Ionization:

HC2H3O2

HC2H3O2

(H2O)

HC2H3O2

H30+ C2H3O2-

HC2H3O2

HC2H3O2

Note: At any given time only a small portion of the acid molecules are ionized and since reactions are running in BOTH directions the mixture composition stays the same.


Ionic equations

What is the total ionic equation for the following formula unit equation?

HF(aq) + KOH(aq)  KF(aq) + H2O(l)

weak strong strong electrolyte non-electrolyte

Overall ionic equation:

HF(aq) + K+(aq)+OH-(aq)  K+(aq)+F-(aq) + H2O(l)

Net ionic equation: (Cross out the spectators)

HF(aq) + OH-(aq)  F-(aq) + H2O(l)

HF is a weak acid

weak electrolyte


Ionic equations

What is the total ionic equation for the following formula unit equation?

HC2H3O2(aq) + NaOH(aq)  NaC2H3O2(aq) + H2O(l)

weak acid strong base strong electrolyte weak electrolyte

Overall ionic equation:

HC2H3O2(aq) + Na+(aq)+OH-(aq)  Na+(aq)+ C2H3O2-(aq) + H2O(l)

Net ionic equation: (Cross out the spectators)

HC2H3O2(aq) + OH-(aq)  C2H3O2-(aq) + H2O(l)


Ionic equations

Net Ionic equations with Single Replacement RXNs:

Cu(s) + 2AgNO3(aq) Cu(NO3)2(aq) + 2Ag(s)

Cu(s) + 2Ag+ + 2NO3- Cu2+ + 2NO3- + 2Ag(s)

Over-all:

Cross out the spectator ions.


Ionic equations

Net Ionic equations with Single Replacement RXNs:

Cu(s) + 2AgNO3(aq) Cu(NO3)2(aq) + 2Ag(s)

Cu(s) + 2Ag+ + 2NO3- Cu2+ + 2NO3- + 2Ag(s)

Over-all:

Cu(s) + 2Ag+ Cu2++ 2Ag(s)

Net ionic Eq.:

Copper is more reactive

than silver!


Ionic equations

Let’s try: Mg in HCl(aq)

Mg(s) + 2HCl(aq)  MgCl2(aq) + H2(g)

Mg + 2H+ + 2Cl- Mg2+ + 2Cl- + H2(g)


Ionic equations

Fe in AgNO3(aq)

HCl and NaHCO3(aq) 

NaOH and H3PO4(aq)


Ionic equations

Study for a Quiz!


  • Login