Research Notes I, 1949

Oct. 4, '49

Mo#2 Add one (?) gram of K₃Fe(CN)₆ to 5 c.c. of 4 M K₂MoO₄ to make 6 c.c. of soln Molarity of Mo = 4 x 5/6 = 3.3

Mn#1 0.7 gms of KMnO₄ in 20 c.c. of soln = 0.222 Molar

Mn#1 0.18M KMnO4 Resonance at 6.87 MC 7.21 MC 0.8 M Co(NO3)2 Ho = 6600 grams Mn#2 0.151 gms KMn04 in 5c.c, soln 3c.c. of Co(No3)2(2 molar) in 5c.c. soln Molarity of Mn=0.151/5/0.158=0.191 Molarity of Co++=3/5x2=1.2 v(Na23)=8845.4+-0.2KC v(Mn55)=8290.0+-0.2KC Dec14, '49 checked by using GR No.271 v(Mn55)/v(Na23)=6.8411/7.3001=0.932124 v(Mn55)/v(Na23)=8290.0/8845.4(1+-3x10-5)=0.937210 M(Na23)/3=0.738875MN M(Mn55)=3.46241Mn(1+-0.01270) =+(3.4624+-0.0004)MN M(Na23)/M(H1)=0.26450+-0.01% M(H1)=2.79348(1+0.00018)

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strontium permanganate Sr(MnO₄)₂ · 3H₂O

M.W. 379.54

solubility = 291 gms/100 ml at 18°C