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Detection Of Known Cations Essay Example

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Topics:

Chlorine, Qualities

Pages: 2 (476 words)
Published: July 17, 2016
Type: Article

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Preliminary Observation of Sample

Yellowish and murky in color.
Contains tiny brown particles inside.
The consistency of the liquid is smooth and fluid.

Observations

Na+ -Flame test produced orangey –yellow flames for a short period of time only. -Color was faint. -Solution might have been contaminated.

NH4+ -After adding 10 drops of NaOH to the sample, a muddy brown solution with tiny solid precipitates. -When tested, litmus paper turned from red to blue.

Ag+ -White precipitate forms after centrifuging, which speculates presence of Ag. -After the addition of HNO3 and NH3, a curdy thick white precipitate formed which confirms presence of Ag

Fe3+ -After centrifuging, murky brownish green precipitates formed. -Confirmatory test proved that Fe was present when solution turned blue

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p style="text-align: justify;">Al3+ -After evaporating, dried yellow substances appeared. After centrifuging, gelatinous white precipitate was noticeable. -When HCl, aluminon and NH3 were mixed, “red lake” formed. Cr3+ -No yellow precipitate formed even with the addition of BaCl2.

Ca2+ -Brown precipitate formed after centrifuging. -No brick-red flame was observed during the flame test.

Zn2+ -After first centrifuging: brownish precipitate formed -After the addition of K4[Fe(CN)6] and HCl, bluish green solution and blue precipitates formed.

Ni2+ -The solution turned strawberry red after adding a drop of dimethygloxine. Presence of Ni2+ is confirmed.

Preliminary Observation of Sample

Color is a really light yellow shade. Close to the color of clean oil -Has the consistency of water. Cation Observations Present? (YES/NO)

Na+ -Sample gave out yellow orange sparks. Yellow flames lasted for 5 seconds. -When Fe(II) Sulfate an

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glyoxime were added, solution turned light brown. Yes

NH4+ -When NaOH was added to the solution, it did not turn the red litmus paper to blue, it remained red. No

Ag+ -After adding HCl and centrifuging, the solution remained to be clear in color. No

Fe3+ -Adding HCl and K4[Fe(CN)6] to the solution formed gelatinous rusty brown precipitate. -Solution turned bluish green with rusty precipitates. Yes

Al3+ -Gelatinous white precipitates formed. -“Red lake” was seen when aluminom was added. Yes

Cr3+ -The adding Ba(OH)2 to the solution did not form any yellow precipitate. No

Ca2+ -White precipitate formed when ammonium oxalate was added to the solution. Yes

Zn2+ -Upon the addition ofHCl and K4[Fe(CN)6], blue green precipitates formed. Yes

Known Anions Detection

Anion
Observations
Sulfate

After the addition of HCl and BaCl2, white precipitate formed. Nitrate
After adding FeSO4, and H2SO4, a brown ring formed on top of the solution. Chloride
After the addition of AgNO3, a curdy white precipitate was formed. Iodide
A violet hue was observed with the mineral oil, HCl and Cl2 after combining all three with the solution. Bromide
After combining mineral oil, HCl and Cl2, a layer of the mineral oil turned brownish orange. Carbonate
After the addition of H2SO4 to the solution, the drop turned milky white.

Detection Of Known Cations Essay Example

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