The conjugate acid of $ C{{H}_{3}}N{{H}_{2}} $ is:
- $ C{{H}_{3}}NH_{3}^{+} $
- $ C{{H}_{3}}N{{H}^{-}} $
- $ C{{H}_{3}}OH $
- $ NH_{2}^{-} $
The Correct Option is A
Approach Solution - 1
Approach Solution -2
The conjugate acid of CH3NH2 is CH3NH3+ that is methylammonium ion.
CH3NH2 is a weak base and forms a conjugate base (CH3NH3+) after accepting protons from an acid.
CH3NH2 + H+ \(\to\) CH3NH3+
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Concepts Used:
Acids and Bases
Acid is any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance. Base is an ion or molecule capable of accepting a hydrogen ion from acid.
Physical Properties of Acids and Bases
| Physical Properties | ACIDS | BASES |
| Taste | Sour | Bitter |
| Colour on Litmus paper | Turns blue litmus red | Turns red litmus blue |
| Ions produced on dissociation | H+ | OH- |
| pH | <7 (less than 7) | >7 (more than 7) |
| Strong acids | HCl, HNO3, H2SO4 | NaOH, KOH |
| Weak Acids | CH3COOH, H3PO4, H2CO3 | NH4OH |
Chemical Properties of Acids and Bases
| Type of Reaction | Acid | Bases |
| Reaction with Metals | Acid + Metal β Salt + Hydrogen gas (H2) E.g., Zn(s)+ dil. H2SO4 β ZnSO4 (Zinc Sulphate) + H2 | Base + Metal β Salt + Hydrogen gas (H2) E.g., 2NaOH +Zn β Na2ZnO2 (Sodium zincate) + H2 |
| Reaction with hydrogen carbonates (bicarbonate) and carbonates | Metal carbonate/Metal hydrogen carbonate + Acid β Salt + Carbon dioxide + Water E.g., HCl+NaOH β NaCl+ H2O 2. Na2CO3+ 2 HCl(aq) β2NaCl(aq)+ H2O(l) + CO2(g) 3. Na2CO3+ 2H2SO4(aq) β2Na2SO4(aq)+ H2O(l) + CO2(g) 4. NaHCO3+ HCl β NaCl+ H2O+ CO2 | Base+ Carbonate/ bicarbonate β No reaction |
| Neutralisation Reaction | Base + Acid β Salt + Water E.g., NaOH(aq) + HCl(aq) β NaCl(aq) + H2O(l) | Base + Acid β Salt + Water E.g., CaO+ HCl (l) β CaCl2 (aq)+ H2O (l) |
| Reaction with Oxides | Metal oxide + Acid β Salt + Water E.g., CaO+ HCl (l) β CaCl2 (aq)+ H2O (l) | Non- Metallic oxide + Base β Salt + Water E.g., Ca(OH)2+ CO2 β CaCO3+ H2O |
| Dissolution in Water | Acid gives H+ ions in water. E.g., HCl β H+ + Cl- HCl + H2O β H3O+ + Clβ | Base gives OH- ions in water. |
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