Anonymous
Anonymous asked in Science & MathematicsChemistry · 6 months ago

You have a mixture of CaCl2 and NaCl in solution. Predict Flame test,Reaction with sulfate,Reaction with carbonate,Reaction with bleach?

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  • 6 months ago
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    CaCl2 and NaCl ....

    1. Yellow color of Na will dominate

    2. Sulfate - CaSO4(s) will form

    3. Carbonate - CaCO3(s) will form

    4. NaOCl(aq) - None ... some bleach may already contain Ca(OCl)2(aq), and bleach contains NaCl.

    Making bleach:

    Cl2(g) + H2O(l) --> HCl(aq) + HOCl(aq)

    2NaOH(aq) + HCl(aq) + HOCl(aq) --> NaCl(aq) + NaOCl(aq) + 2H2O(l)

    This is a solution of bleach: NaCl(aq) + NaOCl(aq) + 2H2O(l)

    It contains some excess OH-, making the solution basic. Some OH- is produced by the hydrolysis of OCl-. You don't want it to become acidic, which would shift the equilibrium back toward Cl2, possibly giving off chlorine gas.

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