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InterviewSolution
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The Conductivity of 0.02M Ag `NO_(3)` at `25^(@)C` is `2.428 xx 10^(-3) Omega^(-1) cm^(-1)`. What is its molar conductivity? |
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Answer» When thin copper leaves are thrown in jar containing chlorine, the copper coming in contact with chloride becomes immediately ignited and burnt with a red light. Chloride of copper is formed. `Cu + CI_(2) to CuCI_(2)` The relatively large electronegativity difference between oxygen and hydrogen is the reason why the partially positively charged hydrogens are attracted to the lone pairs on the oxygen atoms of other water molecules. The relatively smaller electronegativity difference between sulphur and hydrogen is too small to polarise the covalent bond to a required extent. Secondly, the lone pairs on the sulphur atom are delocalised inthe `sp^(3)` orbitals and the d-orbitals an option unavailable to oxygen. So, the negative charge of the lone pairs is also distributed and the interaction is lowered. so, the hydrogen bonding in water causes the water molecules to be associated with each other due to intermolecular forces of attraction, whereas in the case of hydrogen sulphide these forces of attraction are much weaker. So lesser enrgy is requried to overcome the force of interaction between the hydrogen sulphide molecules than those between water molecules. This energy is available at room temperature and hence, hydrogen sulphide is a gas, while water is still a liquid . Molar conductivity = Conductivity `xx (1000)/("molar concentration")` `= 2.428 xx 10^(-3) xx (1000)/(0.02)` `= 2.248 xx 10^(-3) xx 50000` `= 1214 xx 10^(-3) ohm^(-1) cm^(2) mol^(1)` |
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