536  Contributions  from  the  School  of  Pharmacy,  etc.  {Am*Decr,'i^76rnl' 
With  ten  per  cent,  solution  of  orthophosphoric  acid  : 
Four  cc.  of  the  salt  solutions  treated 
with  1  cc.  of  the  orthophosphoric 
acid. 
Barium  chlor.,  5  p.  c. 
"  "  1  p.  c. 
Calcium  chlor.,  5  p.  c. 
"  "     1  p.  c. 
Magnesium  sul.,  5  p.  c. 
Aluminium  sul.,  " 
Ferric  chlor.,  10  p.  c. 
"        "       5  p.  c. 
"  tincture 
Ferrous  chlor.,  5  p.  c. 
Ferrous  sul.,  " 
Lead  nitrate,  5  p.  c. 
"       "      1  p.  c. 
"       "      I  p.  c. 
Lead  acetate,  5.  p.  c. 
"       "        1  p.  c. 
"       "       £p.  c. 
Silver  nitr.,  5  p.  c. 
"       "    1  p.  c. 
"       "    I  p.  c. 
No  pre. 
Resulting  pre- 
cipitates dis- 
solve d  by- 
adding  : 
In  1  cc.  salt  sol.  with  3  cc. 
phos.  acid  sol. 
5/3  <u  s 
■a  "2 
O  o 
C/3 
Pre. 
No 
pre. 
8  cc.  nitr.  ac. 
2  cc.  " 
1  cc.  " 
6  cc.  " 
2  cc.  " 
I  cc.  " 
7  cc.  ortho.  ac. 
I'O  cc. 
1-5  cc. 
12  CC. 
i*6  cc. 
3-0  cc. 
i-6  cc. 
I'O  cc. 
3*0  cc. 
3-0  cc. 
13  cc. 
£  O  rt  Z 
OHO 
36  p.  c. 
o'i  16 
59  " 
0  133 
43  " 
0*177 
59  << 
0-300 
100  4e 
0-177 
59  " 
O'I  10 
36  - 
0*300 
100  " 
0300 
100  " 
0-143 
47  " 
The  lead  precipitates  were  insoluble  in  excess  of  the  orthophos- 
phoric acid  solution. 
With  six  per  cent,  pyrophosphoric  acid  solution  no  precipitates  were 
formed  with  any  of  the  salt  solutions  named  above,  except  those  of 
ferric  chloride,  lead  nitrate  and  acetate,  and  silver  nitrate,  which  were 
formed  as  follows,  on  adding  1  cc.  of  the  pyrophosphoric  acid  to  4  cc. 
of  the  salt  solutions  : 
Ferric  chloride,  tincture ;  precipitate  thick. 
"  "       10  p.  c.j  pre.  soluble  in  20  cc.  of  pyro.  ac.  or  5  cc.  HCI. 
«  «  5      «         «  <t  5  cc<  «  or  3  cc<  a 
«  «  j     «         «  «  2  cc  a  or  j-5  cc>  « 
"  "  not  soluble  in  pyro.  acid,  sol.  in  1  cc.  nitric. 
"       "  "  «  "    0-3  cc. 
Lead  nitrate, 
Lead  acetate, 
Silver  nitrate, 
015  cc. 
3  cc. 
o'8  cc. 
0-4  cc. 
0-5  cc. 
no  pre. 
1  The  neutralization  was  predicated  on  formation  of  two-thirds  metallic  salt. 
