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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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{latex}
$$
[AlO_{4}Al_{12}(OH)_{24}(H_{2}O)_{12}]^{7+}
$$
{latex} |
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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. 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 |
Where
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{latex}$$
C_{LabStock}
$${latex} |
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concentration
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of
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lab
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stock
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that
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is
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written
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on
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the
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container
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{latex}$$
V_{LabStock}
$${latex} |
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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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{latex}$$
C_{ExperimentStock}
$${latex} |
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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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|---|
{latex}$$
V_{ExperimentStock}
$${latex} |
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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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{latex}
$$
V_{LabStock}
$${latex} |
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{latex}
$$
V_{ExperimentStock}
$${latex} |
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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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