Chemistry lab

leaf

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#1

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#1

can anyone tell me what's the molecular mass of ethanedioic acid crystal?
i don't know the H2O is consider or not.
i.e. HOOC-COOH*2H2O or just HOOC-COOH?
Thanks.

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king of swords

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#2

Report 17 years ago

#2

(Original post by leaf)
can anyone tell me what's the molecular mass of ethanedioic acid crystal?
i don't know the H2O is consider or not.
i.e. HOOC-COOH*2H2O or just HOOC-COOH?
Thanks.

The crystal includes 2H2O, so the Mr of the crystal will include that too.

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leaf

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I see, thanks.
then, if the name stated Acid Anhydrite, no water was included, right?

Also, can you give me some example of Aliphatic dibasic acid?
i just know it has two ionizable hydrogen atom, what does Aliphatic means?

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king of swords

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#4

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(Original post by leaf)
I see, thanks.
then, if the name stated Acid Anhydrite, no water was included, right?

yes

(Original post by leaf)
Also, can you give me some example of Aliphatic dibasic acid?
i just know it has two ionizable hydrogen atom, what does Aliphatic means?

Aliphatic just means any compound that isn't aromatic, NB: an aromatic compound has a benzene ring in it.
So ethandioic acid is an example of an aliphatic dibasic acid.

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king of swords

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#5

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(Original post by leaf)
I see, thanks.
then, if the name stated Acid Anhydrite, no water was included, right?

Also, can you give me some example of Aliphatic dibasic acid?
i just know it has two ionizable hydrogen atom, what does Aliphatic means?

Wait a minute....."acid anhydrite" or "acid anhydride"?

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leaf

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sorry........>.<
it's Acid Anhydride

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king of swords

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#7

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(Original post by leaf)
sorry........>.<
it's Acid Anhydride

Well in that case.......acid anhydride ISN'T just the acid crystal take away the water:
It is the product after removing water from the actual compound of the acid to make (RCO)O(OCR')

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leaf

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#8

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so, is (HCO)O(OCH) a aliphatic dibasic acid anhydride?

i think i always misunderstand the chemical term in organic chemistry......

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king of swords

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#9

Report 17 years ago

#9

(Original post by leaf)
so, is (HCO)O(OCH) a aliphatic dibasic acid anhydride?

i think i always misunderstand the chemical term in organic chemistry......

yes that is correct.

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leaf

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#10

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#10

woooooo......

thanks sword~~
i can write up my lab report now~~

thanks~~

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