1811
V O L U M E 2 6 , NO. 1 1 , N O V E M B E R 1 9 5 4 S , provides the desired measure of the ferrous iron content of the impure titanous solution, each miiiiliter cont,aining S J X 55.8 mg. of ferrous iron. CORRECTION FOR IRON CONTENT AZiD CALCULATION OF EFFECTIVE KORMALITY O F TITANOUS SOLUTION
.Ytns defined above is the effective normality of the impure titanous solution Lvhen employed in a ferrous-titanous procedure such as the nitroglycerin determination ( 1 ) . It is readily calculated by subtracting N , from the uncorrected normality of the impure titanous solution found bj- the direct titration :igainPt potassium dichromate with sodium diphenyl 1)riizidinc. sulfon:tte as indicator.
.\-b
=
;Vu - S J = 0.2222 - 0.0033
=
0.2189
This example is illustrative of a solution that contains an appreciable amount of iron. Generally the corrections for solutions prepared from titanium hydride are negligible. ACKNOWLEDGMENT
This paper is published v i t h the permission of FY. B. AIc1,ean. technical director, U. P.S a v a l Ordnance Test Station. LITERATURE CITED
Becker, W ,'A7,,IKD.EKG.CHEM.,ANAL.ED.,5, 1.52 (1933). Rreit, J . E., J . Assoc. Ofic. A g i . Chemists, 31, 573 (1948); 32, 589 (1949). Butts, P. G., Rleikle, W. J., Shovers, J., Kouba, D. L., and ASAL. C"af., 20, 947 (1948). Becker, W.W., Laniond, J. J., Anal. Chiin. Acta, 8, 217 (1953). Rodden, C. J., and Goldbeck. C . G . , AZTAL.CHEM., 24, 102 (1952). Shacfer, W.E., and Becker, W.K , Ibid., 25, 1226 (1953). Siggia, Sidney, "Quantitative Organic ..inalysis via Functional Groups,'' p. 82, Xew York, John Wiley B. Sons, 1949. Stenger, \'. A,, h . 4 1 , . CHEM.,23, 1540 (1951). Sternglanz, P. D., Thon~pson,11. C., and Savell, W.L., I b i d . , 25, 1111 (1953). Wagner, C. D., Smith, I
