ana Anións Report Sheet Questions and Problems Q.1 How do the tests on known sol
ID: 579780 • Letter: A
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ana Anións Report Sheet Questions and Problems Q.1 How do the tests on known solutions containing cations and anions make it possible for you to identify the cations or anions in an unknown substance? Q.2 You have a solution that is composed of either NaCI or CaCl, What tests would you nun to identify the compound? Q.3 If tap water turns a deep red color with a few drops of KSCN, what cation is present? Q4 A plant food contains (NHPOWhat tests would you run to verifly the presence of the NH: ion and the POs3 ion? Q.5 Write the symbol of the cation or anion that givets) the following reaction: _-a. Forms a precipitate with AgNo, that does not dissolve in HNO3 b. Forms a gas with HCI -c. Gives a bright, yellow-orange flame test d. Forms a precipitate with BaC12 that does not dissolve in HNO3Explanation / Answer
(1)
Most of the ion identification tests depend on specific color formation reactions by specific ions, so performing those tests on the unknown solutions help in their identification.
(2)
Add H2SO4 to the solution. If a ppt forms, then the salt is CaCl2, otherwise it is NaCl.
(3)
Tap water contains Fe3+, because it forms blood red color on reaction with KSCN.
(4)
Add cold NaOH solution to the unknown solution, and if a pungent smelling gas is released which turns red litmus blue, then the gas is NH3 and the ion is NH4+.
PO43- ion reacts with (NH4)2MoO4 in acidic conditions to give a yellow ppt.
Hope this helps !
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