Research Notes I, 1949

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Dimensions of RF Head

Deep 1 1/4"

Wide 2 11/16"

Form wid 29 mm Lenth 2 1/2"

Last edit almost 4 years ago by awhtou
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Sept. 8, '49

H₂PtCl₆ ⋅ 6 H₂O 5% soln 27.6 c.c.

H₂PtCl₆ ⋅ 6 H₂O evaporated to dryness turned to a dark brown substance, which was dissolved in HCl & conc. H₂SO₄. Added NH₄OH to the soln. A yellow precipitate was obtained. It is (NH₄)₂PtCl₆. Evaporated the filtrate. Precipitated again with NH₄OH. Repeated 3 times until not too much pt left in soln (the color of soln is very light). Fused (NH₄)₂PtCl₆ in a crucible. Platinum sponge was obtained. It weighed 684 mg Dissolved Pt sponge in aqua regia.

H₂PtCl₆ ⋅ 6 H₂O recovered.

29.334 28.650 0.684 gm Pt

Last edit almost 4 years ago by awhtou
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Sept. 12, '49

Preparation of Enriched CdIII Sample

Quantity 1.5 gms of CdS (M.W. = 144.47) ~ 80% of CdIII.

Will prepare 3 c.c. of CdSO₄ soln: Molarity = = 3.46 ✓

(a) CdSO₄ will be obtained by boiling CdS in 20% H₂SO₄.

(b) Add sufficient amount of MnCl₂ into it

[Break]

Recovery of CdS

(a) CdSO₄ + MnCl₂ soln will be [blank space] by NH₄OH

(b) Mn will be Manganous salt will be oxidized to manganic salt & precipitated out by HMn₄OH KMnO₄ which will be added such that the soln appears a little bit biolet.

(c) After filtering out the manganic salt, decolor [thi?] soln by adding a little K₂⋅O₂

Last edit almost 4 years ago by awhtou
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(d) CdS will be precipitated out by passing H₂S thru the filtrate.

(e) In order to avoid loss of CdS by filtering the soln will be sucked out by & washed by water several times.

(f) CdS will be dried in a vacuum decicator.

Solubility of CdS per 100 gms of H₂O =0.00013

Loss of CdS by washing 10 times with 100 ml H₂O = 1-(0.99987)10 = 1-0.9987 = 0.0013 = 0.13%

Last edit almost 4 years ago by awhtou
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Sept. 14, '49

Pt195 (5975 [right arrow] 5950)

Na23 (7350 [right arrow] 7325)

H0 ~ 6600 gauss

Na23 Resonance (7350 [right arrow] 7325 KC)

Time Marker Dist. Resonance Dist. Marker Resonance Frequency ν
8 min 62.[illegible] 38.2 1 7334.9 KC -0.2 0.04
60 63.5 38.0 1 7335.1 0 0
94 64.[illegible] 39.0 1 8334.9 -0.2 0.04
130 63.5 38.0 1 7335.1 0 0
164 64.5 38.2 1 7335.3 +0.2 0.04
[Break]
[nu bar] = 7335.06 KC
±0.17
[Break]

Pt195 (5975 [right arrow] 5950 KC)

Time Marker Dist. Resonance Dist. Marker Resonance Frequency ν {{tex: $\Delta\nu = \nu - \bar{\nu}$ :tex}} {{tex: $(\Delta\nu)^2$ :tex}}
42 min 66.8 37.1 1 5961.2 KC -0.2 0.04
77 67.5 36.9 2 5961.2 -0.2 0.04
110 67.0 36.2 1 5961.6 +0.2 0.04
147 67.1 37.0 1 5961.3 0.1 0.01
180 66.5 35.7 1 5961.7 +0.3 0.09
[Break]
[nu bar] = 5961.4 ± 0.23
Last edit almost 4 years ago by awhtou
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