IMIDES OF BENZENEDISULPHONIC ACIDS. U 



Water found 7. 64^4 



!SO H SO 1 

 '* ' '* '}NH, 2 ILO 7.60,, 



b) Sulphur and iiitrogeu were estimated with the anhydrous 



substance. 

 0.1124 gr. gave 0.2420 gr. of barium sulphate. 



Sulphur found 29.56 ^o 



calculated 29.2.5 „ 



0.1688 gr. gave 9.3 c.c. moist nitrogen at 11.5° and 750 m.m. 



Nitrogen found 6.45 »^ 



„ calculated 6.40 ,, 



The potassium salt. 



a) Water of crystallisation. 



0.1403 gr., on heating to 200°, lost 0.0071 gr. 



Water found 5.06 ^^ 



Calculated for KN I ' i NK, U- H,.0 4.99,, 



\S0. . C«H, . SO J 



b) Potassium, determined as sulphate by heatiug the salt 



with sulphuric acid and igniting. 



0.1403 gr. gave 0.0453 gr. potassium sulphate 

 0.2026 gr. „ 0.0653 gr. 



ri4.509^ 

 114.47 „ 



Potassium found 



,, calculated 14.45 ,, 



c) Solubility. 



1.6293 gr. of the aqueous solution saturated at 24^^ gave 0.0250 gr. of 

 potassium sulphate on evaporation and ignition with sulphuric acid. 



