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Prof. J. W. Mallet on the Atomic Weight of Lithium. 353 
2.—4-6440 orm. of LiO, SO, required 10-2940 Or 
pcitoHo & Mee Pe tae 
B, 1—5:0675 grm. of NaO, SO, required 8-6920 grm. of 
—5-1107 grm. of NaO, SO, required 87688 grm. of 
. nO Peeps » SO, req grm 
C, 1.43380 grm. of MgO, SO, required 8:8318 grm. of 
a 
C, 2.—4-6625 grm. of MgO, SO, required 94872 grm. of 
BaCl+2HO. 
Calculating now from B, and ©, the amount of crystalline 
chlorid of barium necessary to precipitate an equivalent of NaO, 
SO, or MgO, SO,, we get the following numbers, which repre- 
sent what may be called the practical equivalent of ‘the chlorid of 
arium as actually used. 
Means. 
From B, 1 _ 121-78 fee 
gt BBN cick cack ws am 
i cane ; 129-12 
the theoreti pr eM of BaCl+2HO being 122°1—the pres- 
nee of any water over the normal two atoms tends to raise the 
practical equivalent—the presence of any BaCl in the precipitated 
BaO, O, has the same effect,—the presence of either of the ae 
ble sulphates i in the same precipitate leads to an opposite 
From this practical equivalent of chlorid of barium and ths 
Tesults given above under pi and A, 2, we may calculate the 
equivalent of lithium. If w ends for chlorid of barium the 
number 121-80—that obtained by the precipitation of NaO, SO, 
—we have for 
: $8004-+12180_, 92=Li0, SO 
54-92—48(SO0, +0)=6:92=Li 
and for A, .F 
4°6440+121'80_n 1.0% 1:0 so 
10-2940 ee oe 
. 54:95—48=6°95=Li. 
The mean of the two results is 6°935. . : 
we take for chlorid of barium the num ived 
Bom ing experiments with i SO,—we - by by a similar cal- 
= ‘ Pe ie a7 OY. 
rere Pa ats 
or, in the mean, 7:08. 
SECOND SERIES, Vo, XXVIII, No. 84.—NOV., 1859. 
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