warmup 11/19/15 tell me a story about something that can soak up water objective tonight’s...
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Notes on Hydrates Some chemicals have the ability to soak up and hold water. The water bonds to the chemical structure of the crystal. We call chemicals that can do this hydrates. Hydrates usually contain a specific ratio of water to chemical.TRANSCRIPT
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Warmup 11/19/15
Tell me a story about something that can soak up water
Objective Tonight’s HomeworkTo learn how chemicals can absorb and hold water
pp 214: 65, 66pp 215: 67, 68, 69
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Notes on HydratesSome chemicals have the ability to soak up and hold water.
The water bonds to the chemical structure of the crystal.
![Page 3: Warmup 11/19/15 Tell me a story about something that can soak up water Objective Tonight’s Homework To learn how chemicals can absorb and hold water pp](https://reader036.vdocument.in/reader036/viewer/2022070605/5a4d1af27f8b9ab05997ebe4/html5/thumbnails/3.jpg)
Notes on HydratesSome chemicals have the ability to soak up and hold water.
The water bonds to the chemical structure of the crystal.
We call chemicals that can do this hydrates.
Hydrates usually contain a specific ratio of water to chemical.
![Page 4: Warmup 11/19/15 Tell me a story about something that can soak up water Objective Tonight’s Homework To learn how chemicals can absorb and hold water pp](https://reader036.vdocument.in/reader036/viewer/2022070605/5a4d1af27f8b9ab05997ebe4/html5/thumbnails/4.jpg)
Notes on HydratesTo write a hydrate, we write the chemical name just like regular, but add a dot and the number of water afterwards.
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Notes on HydratesTo write a hydrate, we write the chemical name just like regular, but add a dot and the number of water afterwards.
Example: This is 1 molecule of copper
CuSO4 • 5H2O sulfate with 5 waters attached to each molecule.
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Notes on HydratesTo name hydrates, we say the name of the molecule, and add on the type of hydrate.
Molecules of water Name 1 monohydrate 2 dihydrate 3 trihydrate 4 tetrahydrate 5 pentahydrate 6 hexahydrate 7 heptahydrate 8 octahydrate 9 nonahydrate 10 decahydrate
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Notes on HydratesTo calculate the number of the hydrate we do the following:
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Notes on HydratesTo calculate the number of the hydrate we do the following:
- Calculate the mass of the compound with water.- Heat it up to drive off all the water. (We call this anhydrous)- Measure the mass again and find the difference.
![Page 9: Warmup 11/19/15 Tell me a story about something that can soak up water Objective Tonight’s Homework To learn how chemicals can absorb and hold water pp](https://reader036.vdocument.in/reader036/viewer/2022070605/5a4d1af27f8b9ab05997ebe4/html5/thumbnails/9.jpg)
Notes on HydratesTo calculate the number of the hydrate we do the following:
- Calculate the mass of the compound with water.- Heat it up to drive off all the water. (We call this anhydrous)- Measure the mass again and find the difference.
This difference is the mass of the water. Find the number of the moles of dry material and of the water to find the ratio.
![Page 10: Warmup 11/19/15 Tell me a story about something that can soak up water Objective Tonight’s Homework To learn how chemicals can absorb and hold water pp](https://reader036.vdocument.in/reader036/viewer/2022070605/5a4d1af27f8b9ab05997ebe4/html5/thumbnails/10.jpg)
Notes on HydratesExample:What is the formula for a hydrate that is 90.7% SrC2O4 and 9.30% H2O?
SrC2O4 = 175.62 amuH2O = 18.01 amu
Next, we treat this like percent composition.
90.7 g * 1 / 175.62 = 0.5163 mol SrC2O4
9.7 g * 1 / 18.01 mol = 0.5385 mol H2O
Just about the same number, so our ratio is 1:1So… SrC2O4 ● H2O
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Practice on HydratesOpen your book to page 218 and practice problems 114 and 116.
Like usual, the answers will be up front on the desk.
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Exit Question
Name the following hydrate: Mn(NO3)2 • 4H2O
a) Manganese (II) Nitrate tetrahydrateb) Magnesium (II) Nitrate tetrahydratec) Manganese (II) Nitrate quadrahydrated) Magnesium (II) Nitrate quadrahydratee) Manganese (II) Nitratef) Magnesium (II) Nitrate