QUINHYDRONE ELECTRODE 



243 



T 1 1 fl 



i 



O 5 IO 15 20 



ccs Caustic Soda Solution > 



Titration curves obtained with the hydrogen and with the quinhydrone 

 electrodes in the presence of air. 

 Ordinates — Values of P H . 



Abscissae — c.c. 's. of 0.2 MNaOH added to 20 c.e.'s of the acid component. 



-!- hydrogen electrode values. 



Q Quinhydrone electrode values. 



