*** This version of Confluence is for testing only and contains a copy of content from June 29th 2026. No changes will be preserved. ***
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Making
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PACl
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Stock
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Solutions
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Polyaluminum
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chloride
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(PACl)
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is
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an
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inorganic
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polymer
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coagulant
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commonly
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used
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in
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water
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treatment.
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Its chemical formula is
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$$
[AlO_{4}Al_{12}(OH)_{24}(H_{2}O)_{12}]^{7+}
$$
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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
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{latex}. 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
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$$
C_{LabStock}
$$ |
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| Latex |
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$$
V_{LabStock}
$$ |
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volume
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of
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lab
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stock
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to
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pipette
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out
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$$
C_{ExperimentStock}
$$ |
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desired
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concentration
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of
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stock
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for
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experiments
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$$
V_{ExperimentStock}
$$ |
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desired
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volume
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of
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experiment
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stock
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to
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make
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(usually
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1
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liter)
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USE
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CLEAN
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GLASSWARE
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and
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GLOVES.
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Pipette
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$$
V_{LabStock}
$$ |
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$$
V_{ExperimentStock}
$$ |
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can
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be
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found
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in
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gradations
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of
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250,
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500
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and
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1000
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mL)
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and
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fill
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the
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remaining
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flask
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with
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distilled
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water
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(found
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in
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HLS
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150).
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Pour
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flask
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solution
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into
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the
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container
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that
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will
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be
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used
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for
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experiment
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stock.
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CLEAN
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ALL
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GLASSWARE
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WITH
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DISTILLED
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WATER
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AND
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SOAP.
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Return
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PACl
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stock
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to
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cabinet
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and
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discard
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gloves
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to
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the
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trash.
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