60 



Conductivities and Viscosities in Pure and in Mixed Solvents. 



XlO 4 ; that of the mother solution of sulphuric acid 3.0885X10 4 

 gram-molecules per liter. 



SOLUTIONS. 



I. 50 c.c. methyl orange, diluted to 100 c.c. 

 II. 50 c.c. methyl orange, 5 c.c. sulphuric acid, diluted to 100 c.c. 



III. 50 c.c. methyl orange, 10 c.c. sulphuric acid, diluted to 100 c.c. 



IV. 50 c.c. methyl orange, 15 c.c. sulphuric acid, diluted to 100 c.c. 

 V. 50 c.c. methyl orange, 20 c.c. sulphuric acid, diluted to 100 c.c. 



VI. 50 c.c. methyl orange, 30.9 c.c. sulphuric acid, diluted to 100 c.c. 

 VII. 50 c.c. methyl orange, 35 c.c. sulphuric acid, diluted to 100 c.c. 

 VIII. 50 c.c. methyl orange, 1.0 c.c. cone, sulphuric acid, diluted to 100 c.c. 

 IX. 50 c.c. methyl orange, 2.0 c.c. cone, sulphuric acid, diluted to 100 c.c. 



TABLE 32. 



[I/Io for depth of solution =20 mm.] 



Attention is called to the blank spaces appearing in some of the tables. 

 For some solutions and certain wave-lengths of light no transmission 

 values were obtained. It was known at the time the measurements 

 were made that certain transmission values were erroneous, due either 

 to variations in the current intensity or to vibrational disturbances. 

 The action of light, as has been previously explained, renders these 

 solutions of methyl orange more transparent, and for this reason it 

 was necessary to complete the reading as soon as possible. This 

 excluded the possibility of remeasuring the percentage transmissions 

 made when conditions were unfavorable for accurate readings. 



Table 33 gives the quinoid-salt and azo-base concentrations of each 

 of the above solutions, the hydrolysis constant (K W /K,), and the ioni- 

 zation constant K; of methyl orange as a base. 



TABLE 33. 



