anachem lab midterms practicals (group 5 - 3)

Ammonium ion; group 5

name and what group

NH4+

sodium ion; group 5

name and what group

Na+

potassium ion; group 5

name and what group

K+

barium ion; group 4

name and what group

Ba2+

calcium ion; group 4

name and what group

Ca2+

strontium ion; group 4

name and what group

Sr2+

magnesium ion; group 4

name and what group

Mg2+

manganese ion; group 3

name and what group

Mn2+

nickel ion; group 3

name and what group

Ni2+

ferric ion; group 3

name and what group

Fe3+

cobalt ion; group 3

name and what group

Co2+

zinc ion

name and what group

Zn2+

6M NaOH, Ammonia gas (NH3), Red litmus paper turned to blue, it has urine like odor

Ammonium ion

reagent/s used
product
positive result/s

12M HCl, NaCl, Persistent yellow flame

Sodium ion

reagent/s used
product
positive result/s

HCL and 2 thickness cobalt glass, KCl, Reddish violet flame under cobalt glass

Potassium ion

reagent/s used
product
positive result/s

to filter out the yellow emission of sodium

why is cobalt glass used?

sodium cobaltinitrite Na3Co(NO2)6, potassium sodium cobaltinitrite K2NaCo(NO2)6, yellow ppt

Alternate test for Potassium ion

reagent/s used
product
positive result/s

concentrated HNO3, dinitrogen oxide (N2O), N2O is released

Alternate test for Potassium ion

reagent/s used
product
positive result/s

ammonium gives an identical result

why ammonium ion should be removed when testing for potassium ion?

Ammonium acetate (Nh4Ac), Potassium chromate (K2CrO4), and H2SO4

reagents used in testing for barium ion

Barium Chromate (BaCrO4) and Barium sulfate (BaSO4), white ppt or yellow/ apple green flame

product of barium ion and confirmation

ammonium oxalate (NH4)2C2O4, calcium oxalate (CaC2O4), white ppt

Calcium ion

reagent/s used
product
positive result/s

TEA/ Triethanolamine [N(CH2CH2OH)3 and Ammonium sulfate [(NH4)2SO4
]

reagents used in testing for strontium ion

strontium carbonate (SrCO3), white ppt

product of Strontium ion and positive result

ammonium hydroxide (NH4OH) and sodium hydroxide (NaOH)

reagents used in testing for magnesium ion

magnesium hydroxide [Mg(OH)2], white gelatinous ppt

product of magnesium ion and positive result

Sodium bismuthate (NaBiO3) and Conc. HNO3

reagents used in testing for manganese ion

Permanganate (MnO4-), purple ppt

product of manganese ion and positive result

dimethylglyoxime (DMG) (C4H6N2O2H2) and Ammonium hydroxide (NH4OH)

reagents used in testing for nickel ion

Nickel bis (dimethyl glyoximate) Ni(C4H6N2O2H)2 and strawberry ppt

product of nickel ion and positive result

HCl and Potassium Thiocyanate (KSCN)

reagents used in testing for ferric ion

Iron (III) / Ferric thiocyanate (FeSCN2+) and deep/blood red solution

product of ferric ion and positive result

stannous chloride ( SnCl2), KSCN and Acetone

reagents used in testing for cobalt ion

Cobalt thiocyanate ion (CoSCN4-2), and deep blue complex

product of cobalt ion and positive result

thioacetamide (CH3CSNH2), Zinc sulfide (ZnS), white ppt

ZInc ion

reagent/s used
product
positive result/s