Pages
37
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
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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
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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%
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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 |
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 |