27
CONTRIBUTIONS FROM THE UNIVERSITY OF MICHIGAB. TABLE
11L-r~ 100 PARTS
Fe,O,, A1,0,, Mn,O,
PURE ASH (EXCLUDING
AND
SO,). Broom Sedge.
C1 ............................ 7.48 SO, .......................... 4.59 P,O, .......................... 7.79 K,O ........................ 54.02
Wire
Blue Thistle.
Potato Weed. Purslane.
11.77
4.76 4.38 5.46 32.72 2.77 44.11 6-87
4.47 4.43 12.34 3.32 23.08 5.40 23.82 63.27 1.24 3.66 19.03 11.08 17.03 9.84 -1.01 -1.00
Grass.
15.75 7.75
44.96 hTa&......................... 2.13 7.93 CaO ......................... 19.78 9.54 MgO ......................... 5.93 4.95 Deduct 0 replaced by Cl.. ..... .-1.72 -2.65 -1.07
- - --
-
--
100.00 100.00 100.00 100.00 100.00 Sumach. Sassafras. Rag-weed. Mullein.
c1............................ SO, .......................... P,O, ........................ K,O ......................... Na.@ ....................... CaO
........................ .........................
Deduct, 0 replaced by C1. .......
.85 8.43 9.18 46.90 2.19 26.24 6.40 -.19
Dock.
.26 8.51 3.47 10.03 11.89 8.31 7.78 8.73 13.07 8.30 6.54 7.48 36.37 32.59 58.30 55.60 6.66 33 3.54 7.65 24.33 45.07 20.27 9.11 7.49 12.21 5.88 3.66 -.06 -.82 -.78 -2.26
- --
--
--
100.00 100.00 100.00 100.00 100.00 IJNIVERSITY OF VIRQINIA, Dec., 1879. V.-~ONTRIBL'TIONS
FROM THE CHEMICALLABORATORY OF UXIVERSITYOF MICHIGAN.
THE
BY ALBERTB. PRESCOTT. 1. ALUMINATES OF POTASSIUM
A N D SODIUM I N SOLITTION.
T h e composition of certain solid aluminates of metals of the alkalies and alkaline earths, was well established long ago. Also, there are recorded observations of the action of water upon alkali aluminates, either effecting complete solution, or partial dissociation. Not finding statements of the proportions of potassiiim hydrate and sodium hydrate, necessary to dissolve precipitated aluminiiim hydrate, the writer instituted determinations of these data, in order to show the atomic ratio of K and Na, t o AI, in the aluminate solutions, with different quantities of water, in the conditions of re-dissolved precipitate so common in chemical operations.* *These operations for determination of potassium aluminate and sodium aluminate, were entrusted to the execution of Mr. J. N. Ayres.
J'dccsRiu~i~, ill
z i i i (It?.
Two solutions of aluminiuni salt \ v c w i i w I , o i i t ' a dwinormal solution of potassium aluiiiiiiiurn s i i l p l i a t e , I < ~ ~ ~ I ~ ( S 0 4;) ~ t h.e~ ~ a ( i . other, one-third stronger, or taiitli of 1 i i ~ ) r i n a Isolritioii of t l i r s:iinta salt-this beirig a iie;irly s:itnr:itcll suliitioii, Thesc~;Lliiniiiiiuin s t l t solutions were treated respectively witli iiornia1 and tlecinorrnal solutions of potassium hydrnte, KOII, until the ptwipitnte at, first forinetl had just all dissolved. T h e deteriniiiatiunh \ v ( w rn:ttle at ; { 0 7('., t h c i i a t 5o', and then a t 70"; a i d eac.11 c l e t r i ~ i n i ~ i ; ~ w t ia~h~iiia(lc ri 1i.v trililicate trial. 'I'hc three triols, :iccqitetl f o r each dCteriiiiii:itioii, (lid not vary one from anotlicr by as iiiricli :ts t\r-o-teiitlis (1ril)ic rc~iitini(~t(~r. '1'11~ trials a t the different teniprratrirrs gave the, s : m c i x . s i i l t 3 . iYli(:ii t h t . results were attained, that tlic alumiriiuin precaipit:itt> hac1 , j u s t dissolved under the continued addition of t h e Iiotashiitrn Iiy(ii.atc, it was found that tlic addition o f the first drop of c1cc:itiornial solritioii of sulliliiiric :wid, i l l a l l t r k l s , reproduced the piwi1iitiitv. In n i o h t c'ases, t h e quantity of aluriiiiiirirn salt solutiori takeii \vzs 5 t'.r. It w;is the single result, under all the conditions of t1ilntii.m :in11 tcriipcvxtiirci namcwl, that 1 (*.c. qf' ( I & i t i o I ~ i i u d ~ ~ l i i l i i~i !;ml ~~ ( t lsolittioic f m,t~;iw? 8 i ' . ( ' . Of' tleCi)bfJ,nLCll J)#t/,ltSSi!6ttc / / , ~ ( 7 t ~ l ct 8( ;d i l t ; O ) l . ( ' ~ ~ I l l F 3, e,
