CONDUCTIVITY OF SODIUM HYDROXIDE IN AQUEOUS SOLUTION. 



269 



Weight of pot and solution 1254' 56 grammes. 



- 914-95 



Apparent weight of solution 

 Air 



True weight of solution = 339-85 



Strength of solution = 45 31 per cent. 



From 50 per cent, to 25 per cent. NaOH the density measurements are considered 

 to be accurate within iO'OOOl. Altogether 38 determinations were made within 

 this range, usually at intervals of 2 '5 per cent. These are set out in Table V. In one 

 or two instances individual measurements showed a discrepancy of as much as 0*0002, 

 but no difficulty was experienced in deciding which figure should be adopted, and in 

 every doubtful case fresh dilutions were made direct from the standard 50-per cent, 

 solution. The measurements made at 25 per cent, and 20 per cent. NaOH are 

 tabulated in order to illustrate the degree of accuracy obtained. 



TABLE HA. 



TABLE HB. 



NOTK. s = sinker; p = pyknometer. 



