Measure 0.400 g of KMNO. using a 50-mL beaker as the sample pan. Make sure to press the tare button before placing KMNO4. Do not return any excess chemical in the reagent bottle. Dissolve the KMNO. with 20.0 mL of distilled water. Stir gently to avoid any loss. Transfer the solution to a 100-mL volumetric flask fitted with a small funnel. To avoid spilling, use a stirring rod in transferring the solution. To remove the last drop, place the stirring rod on the sprout of the beaker. Wash the remaining potassium permanganate in the beaker by adding more water to the beaker, stir and transfer it again in the volumetric flask following the same procedure. Repeat this washing until no trace of the color of potassium permanganate remains. Record the number of washings made. Rinse the stirring rod, allowing the rinse water to flow into the volumetric flask. Finally rinse the funnel and remove it from the flask. Use the wash bottle in rinsing. Dilute the solution in the volumetric flask to the mark (lower meniscus must be on the mark measured at eye level). Stopper the flask. Shake the solution by making several inversions (about 10 times) allowing the bubbles to reside on the top of the neck before making another inversion. Compute the concentration of the solution made.
Measure 0.400 g of KMNO. using a 50-mL beaker as the sample pan. Make sure to press the tare button before placing KMNO4. Do not return any excess chemical in the reagent bottle. Dissolve the KMNO. with 20.0 mL of distilled water. Stir gently to avoid any loss. Transfer the solution to a 100-mL volumetric flask fitted with a small funnel. To avoid spilling, use a stirring rod in transferring the solution. To remove the last drop, place the stirring rod on the sprout of the beaker. Wash the remaining potassium permanganate in the beaker by adding more water to the beaker, stir and transfer it again in the volumetric flask following the same procedure. Repeat this washing until no trace of the color of potassium permanganate remains. Record the number of washings made. Rinse the stirring rod, allowing the rinse water to flow into the volumetric flask. Finally rinse the funnel and remove it from the flask. Use the wash bottle in rinsing. Dilute the solution in the volumetric flask to the mark (lower meniscus must be on the mark measured at eye level). Stopper the flask. Shake the solution by making several inversions (about 10 times) allowing the bubbles to reside on the top of the neck before making another inversion. Compute the concentration of the solution made.
Chapter80: Crystallization: Purification Of Solids
Section: Chapter Questions
Problem 4P
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Transcribed Image Text:A. Measure 0.400 g of KMNO. using a 50-mL beaker as the sample pan. Make sure
to press the tare button before placing KMN04. Do not return any excess
chemical in the reagent bottle.
B. Dissolve the KMNO, with 20.0 mL of distilled water. Stir gently to avoid any loss.
c. Transfer the solution to a 100-mL volumetric flask fitted with a small funnel. To
avoid spilling, use a stirring rod in transferring the solution. To remove the last
drop, place the stirring rod on the sprout of the beaker. Wash the remaining
potassium permanganate in the beaker by adding more water to the beaker, stir
and transfer it again in the volumetric flask following the same procedure. Repeat
this washing until no trace of the color of potassium permanganate remains.
Record the number of washings made.
D. Rinse the stirring rod, allowing the rinse water to flow into the volumetric flask.
Finally rinse the funnel and remove it from the flask. Use the wash bottle in
rinsing.
E. Dilute the solution in the volumetric flask to the mark (lower meniscus must be on
the mark measured at eye level).
F. Stopper the flask. Shake the solution by making several inversions (about 10
times) allowing the bubbles to reside on the top of the neck before making
another inversion.
G. Compute the concentration of the solution made.
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