Chemistry Demystified: Recent Episodes
Udayalakshmi Bhamidipalli
The podcast aims at helping students understand concepts in Chemistry.
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This is the third episode of the series on Acids, Bases and Salts. In this episode, we discuss the properties of acids and bases.
Properties of Acids
Physical Properties:
Sour in taste.
Highly corrosive.
Chemical Properties:Acid (Dil.) + Active Metals*
2HCl (Dil.) + Mg = MgCl2 + H2
2Al + 6HCl = 2AlCl3 + 3H2
Salt + H2 (*Active Metals – MAZFE – Magnesium, Aluminium, Zinc, Iron)
o Metallic (Bi)Carbonates + Acid (Dil.) Metallic Salt + CO2 + H2O
Na2CO3 + HCl (Dil.) NaCl + H2O + CO2
NaHCO3 + HCl (Dil.) NaCl + H2O + CO2
o Metallic (Bi)Sulphites + Acid (Dil.) Metallic Salt + SO2 + H2O
Na2SO3 + HCl (Dil.) NaCl + H2O + SO2
NaHSO3 + HCl (Dil.) NaCl + H2O + SO2
o Metallic Sulphides + Acid (Dil.) Metallic Salt + H2S (Rotten Egg Smell) o FeS + HCl FeCl2 + H2S (Rotten Egg Smell)
Properties of Bases
Neutralization: Acid + Base = Salt + Water
HCl+NaOH = NaCl+H2Oo Ammonium Salts + Alkali = Salt + Ammonia + Water
NH4Cl + NaOH = NaCl + NH3 + H2O
Reaction of alkalis with metal salt solutions:
CuSO4 + 2NaOH = Cu(OH)2 + Na2SO4
Pale blue ppt
ZnSO4 +2NaOH = Zn(OH)2 + Na2SO4
Gelatinous white ppt
Zn(OH)2 + 2NaOH = Na2ZnO2 + 2H2O
Pb(NO3)2 + 2NaOH = Pb(OH)2 + 2NaNO3
Chalky white ppt
Pb(OH)2 + 2NaOH = Na2PbO2 + 2H2O
FeSO4 + 2NaOH = Fe(OH)2 + Na2SO4
Dirty green ppt
FeCl3 + 3NaOH = Fe(OH)3 + 3NaCl
Reddish brown ppt
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In this episode, the definition, classification and preparation of bases are discussed. A couple of tips for learning equations and observations during chemical reactions are touched upon too.
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In this episode, the definition, classification and methods of preparation of acids are discussed. Please keep a notepad and a pen handy, so that you can make notes as you listen to the podcast.
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This podcast explains in detail, the variation in metallic and nonmetallic character and electronegativity in the periodic table.
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In this episode, variation of two periodic properties - Ionization energy and Electron affinity, in the periodic table is discussed.
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The episode introduces some basics of the modern periodic table and touches upon the variation in atomic size in the periodic table.
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