Module 1 Intro
1. Module 1 Intro
1.15. Page 4
Module 1—Chemical Foundations
Ionic Hydrates
water of crystallization: water within a crystal, which is necessary for the maintenance of crystalline properties but capable of being removed by sufficient heat
coefficient: a number used to represent the quantity of molecules or the formula unit of a substance; a number that precedes a chemical formula
An ionic hydrate is formed when an ionic compound combines with water. The water is found within the ionic crystal, but it is not directly bonded to the compound itself. Ionic hydrates can be broken down into two parts. The first part is the portion containing the ionic compound and is written according to the rules you’ve learned in this lesson. The second part is often referred to as the water of crystallization and is named by writing “—water (X:Y)”, where X is the coefficient in front of the ionic compound and Y is the coefficient in front of the water portion.
Read
Read the section titled “Ionic Hydrates” on page 31 of your textbook to see examples of the naming system used for this type of ionic compound.
Self-Check
SC 4. Complete this table.
Chemical Name |
Chemical Formula |
|---|---|
|
Na2SO4 • 10H2O |
calcium hydrogen phosphate–water (1/2) |
|
|
BaCl2 • 2H2O |
sodium carbonate–water (1/10) |
|
Self-Check Answers
SC 4.
Chemical Name |
Chemical Formula |
|---|---|
sodium sulfate–water (1/10) |
Na2SO4 • 10H2O |
calcium hydrogen phosphate–water (1/2) |
CaHPO4 • 2H2O |
barium chloride–water (1/2) |
BaCl2 • 2H2O |
sodium carbonate–water (1/10) |
Na2CO3 • 10H2O |
Read
Read pages 78 to 80 in the textbook, up to “Table 1.”
Try This
Prepare a list of new terms introduced in the pages from the textbook that you just read. Add their definitions. Prepare a concept map or another form of graphic organizer of the new terms introduced and how they are related to one another. You may wish to add in familiar terms like energy level, anion, cation, and ion formation into your organizer to make connections.
Discuss
Show your organizer to your teacher or to other students in your class to see if they can understand how you feel these concepts are related. Place a copy of your concept map in your chemistry folder. You may wish to revise it based on the feedback you get from other people or from what you learn later in this module.