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Qualitative Analysis of Group IV Ions The composition of my unknown #J 10 is Barium, Calcium, and Sodium. Confirmation of Ba 2 +: After I added. 5 mL of 6 M acetic acid to the precipitate from step # 2 the solid dissolved. A yellow precipitate formed after adding 1 mL of water, 2 drops of 6 M NH 3, and. 5 mL 0 f 1 M K 2 CrO 4. This confirmed the presence of barium. Confirmation of Ca 2 +: I added 6 M sodium hydroxide to the orange solution from step three until it was basic (solution turned yellow). A white precipitate formed after adding K 2 C 2 O 4 confirming the presence of calcium.
I also preformed a flame test to confirm the presence of calcium. After dissolving the solid with HCl I observed a red flame due to calcium. Confirmation of Na+: I confirmed the presence of sodium through the process of elimination and a guess on why the flame test did not completely confirm its presence. When performing the flame test I observed a green flame instead of a yellow flame. A yellow flame would confirm the presence of sodium. When I looked closer at the flame I did observe small traces of yellow.
I feel that the green flame of barium prevented me from seeing sodium? s less distinct yellow flame.
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