THE CONDUCTANCE OF SOLUTIONS-VISCOSITIES 143 



a quadratic term to the right-hand member of the equation. In the case 

 of non-associated liquids the value of p may be expressed in terms of 

 the viscosity of the solvent by means of the equation: 



(46) ft = 0.000106 + 0.00561 cp, 



where q> is the viscosity of the solvent. In the following table are given 

 values of the viscosity q>, together with the measured values of p and 

 those calculated according to Equation 46. 32 



TABLE XLVII. 



RELATION BETWEEN THE VISCOSITIES OF DIFFERENT SOLVENTS AND 

 THE PRESSURE EFFECTS. 



Normal solvents. 

 Solvent (p p p calc. 



Anisaldehyde 0.056 0.0 3 420 0.0 3 420 



Benzylcyanide 0.022 0.0 3 234 0.0 3 229 



Nitrobenzene 0.020 0.0 3 217 0.0 3 218 



Furfurol 0.017 0.0 3 204 0.0 3 201 



Benzaldehyde 0.016 0.0 3 194 0.0 3 196 



Acetic anhydride 0.010 0.0 3 178 0.0 3 162 



Acetone 0.003 0.0 3 106 0.0 3 123 



Associated solvents. 



Glycerine 7.0 0.0 3 300 0.0 3 93 



Isoamyl alcohol 0.042 0.0 3 178 0.0 3 342 



Ethyl alcohol 0.012 0.0 3 095 0.0 3 173 



Methyl alcohol 0.006 0.0 3 078 0.0 3 140 



The calculated and observed values of P agree very well for the non- 

 associated solvents, but in the case of the associate^ solvents there is a 

 wide discrepancy between the two. A very simple relation thus exists 

 between the viscosity and the pressure effect in the case of normal sol- 

 vents, while in the case of associated solvents the relation is much more 

 complex. This is as might be expected, for in associated solvents a 

 change in the complexity of the solvent molecules doubtless accompanies 

 any pressure change. It is clear that the difference in the nature of the 

 pressure effects in water and in non-aqueous solvents is chiefly due to the 

 difference in the viscosity effects in these cases. 



w Schmidt, loc. cit., p. 334. 



