Chemistry 40S Unit 1 – reactions in aqueous solutions - Description

Lesson 2 Learning outcomes C12102 Perform a laboratory activity to develop a set of solubility rules C12103 Use a table of solubility rules to predict the formation of a precipitate Solubility rules ID: 792264 Download

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Chemistry 40S Unit 1 – reactions in aqueous solutions

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Lesson 2. Learning outcomes. C12-1-02: . Perform a laboratory activity to develop a set of solubility rules. C12-1-03:. Use a table of solubility rules to predict the formation of a precipitate. Solubility rules.

Tags : rules ionic net solubility ionic rules solubility net equation baso equations writing precipitate step solutions 2cl 2na predict aqueous
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Chemistry 40S Unit 1 – reactions in aqueous solutions






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Slide1

Chemistry 40S

Unit 1 – reactions in aqueous solutions

Lesson 2

Slide2

Learning outcomes

C12-1-02:

Perform a laboratory activity to develop a set of solubility rules

C12-1-03:

Use a table of solubility rules to predict the formation of a precipitate

Slide3

Solubility rules

Solubility rules allow people to predict if a precipitate will form, and if one does---what it is!

Solubility rules rely on standard known

solubilities

for ions at STP (standard temperature and pressure:

0

C and 101.3

kPa

)

In order to use the solubility rules to your advantage when

predicting the product of the combination of two ionic solutions

you must be able to write a

net ionic equation

Slide4

Writing net ionic equations

Step 1: Predict the products of the reaction and ensure that the equation is balanced

Think double-displacement reaction

Example: Reaction between BaCl2 and Na2SO4

BaCl

2

+ Na

2

SO

4

 BaSO

4

+

NaCl

Slide5

Writing net ionic equations

Step

2: Balance the

equation

BaCl

2

+

Na

2

SO

4

BaSO

4

+

2

NaCl

Slide6

Writing net ionic equations

Step 3: Use a table of solubility rules to identify which ionic substances will precipitate from aqueous solutions

Precipitate is a solid

 give it an ‘s’ subscript and the rest an ‘

aq

’ subscript

BaCl

2(

aq

)

+ Na

2

SO

4(

aq

)

 BaSO

4(s)

+ 2NaCl

(

aq

)

This is known as a

balanced molecular equation

Slide7

Writing net ionic equations

Step

4: Separate the aqueous solutions into

their ions

Ba

2

+

(

aq

)

+

2Cl

-

(

aq

)

+ 2Na

+

(

aq

)

+ SO4

2-

(

aq

)

 BaSO

4(s)

+ 2Na

+

(

aq

)

+ 2Cl

-

(

aq

)

This is known as an

ionic

equation

Slide8

Writing net ionic equations

Step 5: Cancel out spectator ions

Ba

2+

(

aq

)

+

2Cl

-

(

aq

)

+

2Na

+

(

aq

)

+ SO4

2-

(

aq

)

 BaSO

4(s)

+

2Na

+

(

aq

)

+

2Cl

-

(

aq

)

Ba

2+

(

aq

)

+ SO4

2-

(

aq

)

 BaSO

4(s)

This is a net ionic equation

Slide9

Solubility rules

A set of rules to help you predict if and what precipitate will form when combining ionic solutions.