You are viewing an old version of this page. View the current version.

Compare with Current View Page History

« Previous Version 14 Next »

Making PACl Stock Solutions

Polyaluminum chloride (PACl) is an inorganic polymer coagulant commonly used in water treatment.  Its chemical formula is

Unknown macro: {latex}

$$
[AlO_

Unknown macro: {4}

Al_

Unknown macro: {12}

(OH)_

Unknown macro: {24}

(H_

Unknown macro: {2}

O)_

]^

Unknown macro: {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

Unknown macro: {latex}

$$
C_

Unknown macro: {LabStock} V_

=C_

Unknown macro: {ExperimentStock} V_

$$

Where

Unknown macro: {latex}

$$
C_

Unknown macro: {LabStock}

$$

 = concentration of lab stock that is written on the container
Unknown macro: {latex}

$$
V_

Unknown macro: {LabStock}

$$

= volume of lab stock to pipette out
Unknown macro: {latex}

$$
C_

Unknown macro: {ExperimentStock}

$$

= desired concentration of stock for experiments
Unknown macro: {latex}

$$
V_

Unknown macro: {ExperimentStock}

$$

= desired volume of experiment stock to make (usually 1 liter)

USE CLEAN GLASSWARE and GLOVES.

Pipette 

Unknown macro: {latex}

$$
V_

Unknown macro: {LabStock}

$$

 into a volumetric flask that matches
Unknown macro: {latex}

$$
V_

Unknown macro: {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.

  • No labels