122 
This table shows: | 
1. that the results of each pair of experiments agree satisfactorily 
(see column I). 
2. thal the volumes of the precipitates vary as the quantities SO, 
used (ef. columns II and III). 
We will now consider to what extent an addition of NaCl influences 
the volume. 
TABLES, 
Effect of NaCl on the volume of the BaSO4 precipitate. 
Ss RE el 
1.5 cc. of HCI sulphate solution +5 cc. of BaClg sol. containing acetone. Es 24 
Su om 
Zom 
1) 2cc. NasSO4 10 aq. 4/9 + 2¥/ecc. of HCI 1:14 0,2cc.of NaCl 90, + 2,8 cc. of HO 82 
2) 2 pl EED Dee ati +28 eeb 
3) 2 4 oy EEE 4 + 2,6 a si 
4) 2 AEN Ou ae ey | Hr eat Oty ial 81 
5): 2 : + 21 » +06 +2,4 tat oi bys 
6) 2 ; + 21g pO BF uy ed ME Ee 
Te 3 3 SEN : AA hl tE 
8) 2 ' 1-21 ARNOTT: ; In NEGO NS 
9) 2 : A Oi ie WEE Bee 08 
10) 2 3 oy, ice ted ; eg So il 
TABLE IIL. 
Effect of Na,HPO, 12 aq. on the volume of the BaSOy, precipitate. 
7.5 cc. of HCI sulphate solution + 5 cc. of the BaCl, sol. containing acetone. 
Number 
ot divi- | 
sions of 
BaSO, 
1) 2cc.of Na;SO, 10aq.4°/9 +2 '4,cc.of HCI: 1+0,2ec.ofNa,HPO,90/,+2,8cc. ofH,0 82) 
2) 2 4 4 2 0e : oy a ae Bae | 
3) 2 : +1 2 DA Pa AE 
4) 2 7 + 2e Brie eh ; DG jon Be) 
5) 2 , HED AUT EDE ee EDA 4. 1824) 
6) 2 3 A aly, Jt Og , MOA ST AML 
7) 2 | 1216 EE ; Bape” he | 80.5 
8) 2 : + 2g geass : On el Bom 
| 
3) The caoutchouc stoppers had let loose some small particies, which mixed 
with the white precipitate. 
