ELECTRICAL CONDUCTIVITY OF CERTAIN SALINE SOLUTIONS. 53 
Columns I. and IIL. are given graphically on the upper part of fig. 1. The 
scale in this case is double that previously employed, on account of the 
sparingly soluble character of this salt. As before, the line is at first curved 
and afterwards straight. The rate of expansion is throughout much slower 
than with sulphate of zinc. The dotted line A, indicates the expansion due to 
the water of crystallisation alone. With regard to this line, the fact mentioned 
above appears again here, namely, that this hypothetical expansion is at first 
ereater and afterwards smaller than that which is observed. The line B, 
indicates what the increase of volume would be if the salt were in the water 
without being dissolved, the specific gravity of the crystals being taken as 
2:254 (MILLER). | 
SULPHATE OF PoTasH. 





Ue ah, III. Te cee UL, | 
Ratio of K,SO, He bap hao Ratio of volume || Ratio of K,SO, He ney ent Ratio of volume 
to water in mater! ae s0° of solution to to water in tise ai 0° C of solution to 
solution. Gomes volume of water. solution. Gismimes. | volume of water. 
1 to 100 1:0082 10018 1 to 20 10394 1:0119 
Ig, 3) 1:0103 10022 Ie 5 LUG 10482 1:0136 
ieee 740 1:0201 10048 Nye, Jel 10697 10189 
5 a) 1:0265 10067 1, 9°488 } 
10801 11054 
er. 20 10319 1:0078 Saturated j 







This table is not given graphically, but the numbers show a slight curva- 
ture or change in the rate of expansion, similar to what was observed in the 
two previous salts. As sulphate of potash is anhydrous, none of the increase 
of volume can be traced to water of crystallisation. The same remark 
applies to 
BIcHROMATE OF PoTasH. 


I. ah Ill. Te pe 10013 
Ratio of K,Cr,0, ee ae ee Ratio of volume || Ratio of K,Cr,0, Be sae vee Ratio of volume 
to water in meten'at 100C of solution to to water in Pera 0° C of solution to 
solution. Cee volume of water. solution. "Ge amrtines: * | volume of water. 
1 to 100 10069 10031 1 to 25 1:0274 1:0123 | 
es 0) 1:0088 10037 Ig, AO) 10345 10150 
ee DO LOS 7 10062 one 5) 1:0452 10205 
ee iA9 1:0172 1:0077 at. ns 
10561 10261 
Io GO) 1:0231 1:0100 Saturated 






