Acetic acid dimerised to an extent of 30% in benzene . The observed molecular mass (in gm) is...

How much ice will separate if a solution containing 25 g of ethylene glycol [C2H4(OH) 2] in 100g of water is cooled to 10°C? Kf(H2O) = 1.86 (25.05 g)

The dielectric con stant of H2O is 80. The electrostatic force of attraction between Na+ and Cl–will be.

Water is a polar colvent and have dielectric constant 80. As NaCl is a polar compound and like dissolves like so, forces of attraction between Na+ and Cl- ion will reduce to 1/80 in water.

Why The phenoxide ion is more stable than phenol ?

The phenoxide ion is more stable than phenol, due to greater dispersal of negative charge, therefore. Equilibrium get shifted to forward direction. whereas alkoxide ion is less stable than alcohols due to intensification of negative charge, so equilibrium get shifted towards backward direction. Hence phenols are more acidic than alcohols. 

Related Questions:

Benzamide is less easily hydrolysed than methyl benzoate. Why ?

Highly branched carboxylic acids are less acidic than unbranched acids. Explain why?

Phenoxide ion is more stable than an alkaoxide. why?

Which is more stable? CH3-CH2+ (Ethyl carbocation) or CH2=CH+ (Vinyl carbocation)? And why?

No Doubt, Ethyl carbocation (CH3-CH2+) is more stable than vinyl carbocation (CH2=CH+). The greater stability of CH3-CH2+ carbocation over vinyl carbocation because the positive charge on the CH2 is stabilised by the inductive effect as well as hyperconjugation  from the neighbouring carbon atom.
But in case of CH2=CH+. The two carbon atoms involved are sp2 hybridised. An sp2 hybridised carbon atom is more electronegative which increases positive charge and increases as the s-character of a hybridised carbon atom increases. As the the result inductive effect decreases by the neighbouring carbon atom.