5

August 12, 1950
Preparation of Na3 Rh(NO2)6
m.w. [molecular weight] NaNO2 = 69.01
m.w. RhCl3 = 209.3
a.w. [atomic weight] Rh = 102.9

One gram of commercial RhCl3 was dissolved in
75 cc. of 1 m. NaNo2 & 5 cc. of 6 m. HC2H3O2; the
mixture was heated at 60-90 degrees for 5 minutes.
(A.A. Noyes & W. C. Bray, A sysem of qualitative analysis
for rare elements, The MacMillan Company, 1948)

Sept. 2 - Sept. 12
Search for As, Zn, using KAsF6 & Zn(CH)4 + HF
concentrated in water bath.

Zn 3.41 ML -> 3.015 ML
at Ho = 11400 G