Barium Meals and Flame Tests

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  • Created by: joshd
  • Created on: 31-03-14 13:12
Describe how you would make a pure, dry sample of barium sulfate, an insoluble salt
1) Mix solutions of barium nitrate and potassium sulfate. 2) Filter out the precipitate of barium sulfate. 3) Wash it with distilled water. 4) Dry it on filter paper.
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What normally happens with bones in relation to X-rays?
Normally only bones show up when you have an X-ray.
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Describe barium sulfate and it's relation to X-rays.
Barium sulfate is opaque to X-rays. When drunk it shows up the gut so that any problems (e.g, blockages) can be seen.
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Describe about barium salts and contrast to barium sulfate.
Barium salts are toxic, but barium sulfate can be safely drunk because it's insoluble. This means it isn't absorbed into the bloodstream - it just passes through the body.
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What is it known as when a patient drinks barium sulfate before an X-ray?
A barium meal.
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What sort of flame does Sodium (Na+) give?
A yellow/orange flame.
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What sort of flame does Potassium (K+) give?
A lilac flame.
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What sort of flame does Calcium (Ca2+) give?
A brick-red flame.
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What sort of flame does Copper (Cu2+) give?
A blue-green flame.
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So, what would happen if you stick a bit of copper wire in a Bunsen flame?
It would turn to a blue-green flame.
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What do flame tests not just work with and what else do they work with? Give an example.
Flame tests don't just work when you've got a sample of a pure element they also work with a compound that contains that elementSo if you stick a sample of copper sulfate in a Bunsen flame,you'll also see a blue-green flame because of the Cu2+ ions.
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How do you flame-test a compound in the lab?
Dip a clean wire loop into a sample of the compound,and put the wire loop in the clear blue part of the Bunsen flame. First make sure the wire loop is really clean by dipping it into hydrochloric acid and rinsing it with distilled water.
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What can you use this method to test for? What if you're using a powdered solid?
To test sodium,potassium, calcium or copper ions in a solid or a solution. If you're using a powdered solid, you can dip the wire in the hydrochloric acid again to moisten it before dipping it in the solid,so that some of the solid sticks to the wire
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Other cards in this set

Card 2

Front

What normally happens with bones in relation to X-rays?

Back

Normally only bones show up when you have an X-ray.

Card 3

Front

Describe barium sulfate and it's relation to X-rays.

Back

Preview of the front of card 3

Card 4

Front

Describe about barium salts and contrast to barium sulfate.

Back

Preview of the front of card 4

Card 5

Front

What is it known as when a patient drinks barium sulfate before an X-ray?

Back

Preview of the front of card 5
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