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Why does the conductivity of a solution decrease with dilution?
The conductivity of a solution is the conductance of ions present in a unit volume of the solution. The number of ions (responsible for carrying current) decreases when the solution is diluted. As a result, the conductivity of a solution decreases with dilution.
Suggest a way to determine the _17-11-08_Utpal_12_Chemistry_3_15_html_66981bef.gif){kind=small}
value of water.
Applying Kohlrausch’s law of independent migration of ions, the value of water can be determined as follows:
_17-11-08_Utpal_12_Chemistry_3_15_html_m263ec852.gif)
Hence, by knowing the values of HCl, NaOH, and NaCl, the value of water can be determined.
The molar conductivity of 0.025 mol L−1 methanoic acid is 46.1 S cm2 mol−1.
Calculate its degree of dissociation and dissociation constant. Given λ °(H+)
= 349.6 S cm2 mol−1 and λ °(HCOO−) = 54.6 S cm2 mol
C = 0.025 mol L−1
_17-11-08_Utpal_12_Chemistry_3_15_html_m649146ee.gif)
Now, degree of dissociation:
_17-11-08_Utpal_12_Chemistry_3_15_html_mef6d27c.gif)
Thus, dissociation constant:
_17-11-08_Utpal_12_Chemistry_3_15_html_m4cd013e0.gif)
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