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'''Presentation on | '''Presentation on Salt crystals by Liese Endler''' | ||
In WS2014/15 I started working with Magnesium sulfate and Aluminum potassium sulfate. | In WS2014/15 I started working with Magnesium sulfate and Aluminum potassium sulfate. To get a saturated solution that will start growing crystals I used following receipts: | ||
To get a saturated solution that will start growing crystals I used following receipts: | |||
Magnesium sulfate solution: | Magnesium sulfate solution: | ||
mix salt and water in relation 1 to 3 | mix salt and water in relation 1 to 3 | ||
e.g. 50g magnesium sulfate + 150g distilled water (warm) | e.g. 50g magnesium sulfate + 150g distilled water (warm) | ||
Aluminum potassium sulfate solution: | Aluminum potassium sulfate solution: | ||
mix salt and water in relation 1 to 2 | mix salt and water in relation 1 to 2 | ||
50g aluminum potassium sulfate + 100g distilled water (warm) | 50g aluminum potassium sulfate + 100g distilled water (warm) | ||
<gallery>Working_with_crystals1.JPG </gallery> | |||
My general observations on salt crystals so far: | My general observations on salt crystals so far: | ||
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- dusk, dirt or small particles of metal( e.g. from the metal spoon that one can use to mix the solution ) can interfere with the growing process | - dusk, dirt or small particles of metal( e.g. from the metal spoon that one can use to mix the solution ) can interfere with the growing process | ||
- if you want to grow a big crystal its important to separate the one that you like the most from the others and put it into a fresh prepared solution that is cold | - if you want to grow a big crystal its important to separate the one that you like the most from the others and put it into a fresh prepared solution that is cold | ||
<gallery>Alauncrystal_1.JPG< | |||
/gallery> | |||
Exercise for the class: | Exercise for the class: | ||
take a drop of magnesium sulfate-solution (MgSO4+H20) onto a microscope slide (Objektträger) | take a drop of magnesium sulfate-solution (MgSO4+H20) onto a microscope slide (Objektträger) | ||
try to work as clean as possible and take care the the drop is not full of dirt or dust | try to work as clean as possible and take care the the drop is not full of dirt or dust. Wait a bit and than start to observe the drop through a microscope | ||
if you are really lucky and a bit patient you can see the crystal growth. | if you are really lucky and a bit patient you can see the crystal growth. | ||
slowly, the salt molecules form straight lines and form solid patterns that remind of an icy surface | slowly, the salt molecules form straight lines and form solid patterns that remind of an icy surface. | ||