: To identify the given Inorganic mixture containing three acidic and three
basic radicals (excluding insoluble and interfering radicals) by Macro Scale Analysis (06 known and
06 unknown mixtures)
Answers
Explanation:
To identify the anionic radicals present in an inorganic mixture of salts by performing various tests.
Theory:
Qualitative analysis involves the detection and identification of acidic and basic radicals present in inorganic salts. Inorganic salts are formed by the reaction of acids and bases or acidic oxides with a base or basic oxides.
Some of the examples of the reaction of acids and bases or acidic oxides with a base or basic oxides are
NaOH + HCl → NaCl + H2O
CO2 + 2NaOH → Na2CO3 + H2O
KOH + HNO3 → KNO3 + H2O
2NaOH + H2SO4 → Na2SO4 + 2H2O
4 Action of dilute.H2SO4:
Add 1 or 2ccs of dilute H2SO4 to a small portion of the salt in a test tube and warm it gently.
Brisk effervescence is obtained from colorless, odorless gas that turns lime water. Anion is Carbonate CO32-
Colorless gas with an odor of rotten eggs is obtained, turning lead acetate black paper. Sulphide anion is present.
Colorless gas with the odor of burning sulfur that turns acidified dichromate green. Sulfate anion is present.
Reddish brown gas is obtained with a fishy odor that turns acidified brown ferrous sulphate. Nitrate anion is present.
Colorless vinegar-flavored gas is obtained. May be acetate anion.
No characteristic observation. Absence of above mentioned anions.
5 Action of Con. H2SO4:
Add 2-3 ccs of Con. H2SO4 to a small amount of salt taken in a test tube and heat it gently.
Reddish-brown vapors that turn moist red paper fluorescent. May be bromide anion.
Colorless gas with a pungent smell that provides dense white fumes with a dipped glass rod in NH4OH solution. May be chloride anion.
Violet colored vapors that turn blue or violet starch paper. May be iodide anion.
Reddish-brown vapors turning brown ferrous sulfate paper into acidified. May be nitrate anion.
No characteristic observation. Absence of all above-mentioned anions.
6 Action of Con. H2SO4 with Cu turnings:
Mix with a few Cu bits a small amount of the salt taken in a test tube, add 2 – 3 ccs of H2SO4 and heat it.
It is observed that copy evolution of reddish brown gas turns acidified ferrous sulfate paper brown. Nitrate anion is present
No reddish brown vapours. Absence of nitrate anion.
7 Action of Con. H2SO4 with MnO2:
Add an equal amount of MnO2 to a small amount of salt in a test tube and add a few ccs of Con. H2SO4 and heat gently.
A greenish yellow gas turns violet (or) blue starch iodide paper. May be chloride anion.
Reddish brown vapors are obtained that turn moist fluorescent red paper. May be bromide anion.
Violet vapors are obtained that turn starch paper blue (or) violet. May be iodide anion.
No characteristic coloured vapours are obtained. Absence of all above mentioned anions.
8 Action of NaOH:
Add a few ccs of 10% NaOH solution to a pinch of salt taken in a test tube and warm it gently.
It is obtained a colorless gas with a pungent s
Answer:
is it that
Explanation:
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