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...

Making

...

PACl

...

Stock

...

Solutions

...

Polyaluminum

...

chloride

...

(PACl)

...

is

...

an

...

inorganic

...

polymer

...

coagulant

...

commonly

...

used

...

in

...

water

...

treatment.

...

 Its chemical formula is

Latex

$$
[AlO_{4}Al_{12}(OH)_{24}(H_{2}O)_{12}]^{7+}
$$

...

.  
...
  For 
...
 all 
...
 experiments 
...
 requiring 
...
 the 
...
 use 
...
 of 
...
 PACl, 
...
 individual 
...
 stock 
...
 solutions 
...
 must 
...
 be 
...
 mixed 
...
 from 
...
 the 
...
 lab 
...
 stock 
...
 solution. 
...
 The 
...
 lab 
...
 stock 
...
 solution 
...
 can 
...
 be 
...
 found 
...
 in 
...
 the 
...
 chemical 
...
 cabinet 
...
 in 
...
 Hollister 
...
 160.
...
When 
...
 mixing 
...
 a 
...
 solution 
...
 for 
...
 your 
...
 experiments:
...
Calculate 
...
 the 
...
 volume 
...
 of 
...
 lab 
...
 stock 
...
 solution 
...
 required 
...
 to 
...
 make 
...
 the 
...
 stock 
...
 for 
...
 your 
...
 experiments. 
...
 (If 
...
 you 
...
 don't 
...
 know 
...
 what 
...
 concentration 
...
 you 
...
 need 
...
 to 
...
 mix 
...
 for 
...
 your 
...
 experiments, 
...
 consult 
...
 your 
...
 team 
...
 leader.) 
...
 Use 
...
 a 
...
 mass 
...
 balance 
...
 to 
...
 solve 
...
 for 
...
 the 
...
 volume 
...
 required


{
 Latex
}$$
C_{LabStock}V_{LabStock}=C_{ExperimentStock}V_{ExperimentStock}
$${latex}


Where

{latex}
Where
 Latex
$$
C_{LabStock}
$$
...
 = concentration of lab stock that is written on the container
 Latex
$$
V_{LabStock}
$$
...
= 
...
 volume 
...
 of 
...
 lab 
...
 stock 
...
 to 
...
 pipette 
...
 out
...

 Latex
...
$$
C_{ExperimentStock}
$$
...
= 
...
 desired 
...
 concentration 
...
 of 
...
 stock 
...
 for 
...
 experiments
...

 Latex
...
$$
V_{ExperimentStock}
$$
...
= 
...
 desired 
...
 volume 
...
 of 
...
 experiment 
...
 stock 
...
 to 
...
 make 
...
 (usually 
...
 1 
...
 liter)
...
USE 
...
 CLEAN 
...
 GLASSWARE 
...
 and 
...
 GLOVES.
...
Pipette 
 Latex

$$
V_{LabStock}
$$
...
 into a volumetric flask that matches 
 Latex

$$
V_{ExperimentStock}
$$
...
 (these 
...
 can 
...
 be 
...
 found 
...
 in 
...
 gradations 
...
 of 
...
 250, 
...
 500 
...
 and 
...
 1000 
...
 mL) 
...
 and 
...
 fill 
...
 the 
...
 remaining 
...
 flask 
...
 with 
...
 distilled 
...
 water 
...
 (found 
...
 in 
...
 HLS 
...
 150). 
...
 Pour 
...
 flask 
...
 solution 
...
 into 
...
 the 
...
 container 
...
 that 
...
 will 
...
 be 
...
 used 
...
 for 
...
 experiment 
...
 stock.
...
CLEAN 
...
 ALL 
...
 GLASSWARE 
...
 WITH 
...
 DISTILLED 
...
 WATER 
...
 AND 
...
 SOAP. 
...
 Return 
...
 PACl 
...
 stock 
...
 to 
...
 cabinet 
...
 and 
...
 discard 
...
 gloves 
...
 to 
...
 the 
...
 trash. 
...