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Lab report question:

$NaCl$
$Na_2CO_3$
$MgSO_4$
$NH_4Cl$
$H_2O$

Identify a chemical reagent out of these 5 that can be used to distinguish $CaCl_2$ from $CaCO_3$. What is the distinguishing observation?

I think it's $Na_2CO_3$ but I'm not completely sure how to answer the question.

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closed as off-topic by Klaus Warzecha, LievenB, Philipp, tschoppi, Helios Mar 18 at 19:55

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Why do you think it is Na2CO3? Given this is a “homework” question, you should give us the maximum information about your thought process so we can help you… –  F'x Oct 7 '12 at 7:15
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1 Answer 1

Two words: Solubility Rules. As this is evidently homework, I won't make the answer any more explicit, but do comment if you need more guidance.

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... and it's even enough to put it beside your sample... –  cbeleites Oct 12 '12 at 14:27
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