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Chemistry Help needed!:-(

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astarmathsandphysics:

--- Quote from: Naruto on May 07, 2009, 10:37:32 pm ---ummm...astar are you answering my question :-\
its the question no. 6 on the last page...about calcium carbonate
i think you checked the wrong question...but its ok you can check and tell me if you knw the answer.
thankshttp://www.mozdev.org/

--- End quote ---

My browser is behaving strangely but are you saying?

Calcium carbonate is found in egg shells. All carbonates react with hydrochloric acid to form
chlorides. Calcium carbonate is insoluble in water but calcium chloride is soluble. Most impurities
in egg shells are insoluble. Plan an experiment to find out if egg shells are 100% calcium
carbonate.

twilight:
k i think u havta put the eggshells in HCl (CaCO3 will react to give CaCl2).. after the reaction .. add water to dissolve the CaCl2 that is formed .. and filter the mixture .. if there is any residue in the filter paper then the eggsells are not 100% .. as only CaCl2 dissolves in water

Naruto:
@ astar
yeah i am asking for that question

@ twilight
Thanks for your answer

hyebyekadal:
Ok need help winter 2005 IGCSE
5 A solid compound X was analysed. Solid X was an aluminium salt. The tests on X and
some of the observations are in the following table.
Complete the observations in the table.
(a) One spatula measure of X was
placed into a hard-glass testtube.
The solid was heated
gently then strongly. The gas
was tested with pH indicator
paper. paper went red

 ms sayss acidic gas/hydrated
and the theres a quesiton about the the substance x and the ms again says a hydrated salt.
if its a hydrated salt then why acidic gas forming?

Christy:
there must be something mentioned above in the question so that they can say hydrated ... maybe it was heated and it gave out h20 vapours ...

the answer is hydrated acid salt ... i think

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