10. 

 4 Br-ehenol - I - pthalsln (Bron Phenol blue) Sietiiyl red, Pcranitro phoncl, 

 Veutmi red, ?. Rr-thyaol • • « r -thalein (Bron tnyrcol blue) Thymol - 3 - pthniaia 

 . «ol blue), Phenol pth*la In an-1 Thy»olpthalolr.. 



.-it lone of Methyl Viol irlla (Orange IV) *ere also 



prepr.rei but none of the eclat i re so acid ea to eoaa iu their rngo, 



Or the oth*r hand, IHi baaic •«!«%] tot ee/or.i %ta range of thle color 



"t so th* hydrogen ier. HHHtfaltW of •nlj' ttM aKire dilute solutions ooul J 

 •a iet*raia».J. 



PRFSSmTXOH OF DATA 

 Before iMflM&nf t&t stp-jrlawate oa regen:*r »t.l >n, a fa* taata were 



made to determine arjiroxiw.tsly Wi J to uaa. The flret, a 



tadpole woe put into I liter of n /l00 solutions (except H3PO4 0.01 aol) j asen 

 of the bases riJa to bo taata I l«ngth of life noted so folloxa • 



Base 



m 



HaOH 



B*(GH) 2 



*ti(0Fi)3 



KH 4 0H 



Length of life of 

 tadpole la minutes 



50 



m 



W 



H 



35 



II i I 



mo 9 



m 



H2SO4 



H3PO4 



CH3COOH 



Length of life ia 

 minutes 



TO 



120 



135 



135 



1M 



Tea control* were run. One, itetilled enter f row the metal at 111; 

 3 waiter *«« uaol In making up the solution*, an 4 I3M Hmnf to e.lbainite the 

 poaelbUlty of oestotie pressure having produced the effect, a solution ccn- 

 •Uiilli oi II parte 0.01 «ol. KH^PO^ nn 13 pcfrta 0.01 sol. Ha 2 HPO4 which ie 

 the • tact nautralltT buffer solution of Levy, Rowotrae and M-svrlott (1915) 

 diluted to 0.01 *ol. Ia the forcer the taiealf lived fir.* days; ia the latter 

 rt freight da 7a. 



The second aeriee wea in .001 normal solutions (except R3PO4 whieh 

 vae .001 moi.) and gate tha following reaulta: 



