experiment 8 limiting reactant in berans manual here https://books.google.com.eg
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experiment 8 limiting reactant in berans manual
here
https://books.google.com.eg/books?id=X3KX6p8hnlIC&lpg=PA117&ots=AelGi5MAoO&dq=To%20determine%20the%20limiting%20reactant%20in%20a%20mixture%20of%20two%20soluble%20salts%20%E2%80%A2%20To%20determine%20the%20percent%20composition%20of%20each%20substance%20in%20a%20salt%20mixture&hl=ar&pg=PA117#v=onepage&q&f=false
1. The limiting reactant is determined in this experiment.
a. What are the reactant (and their molar masses) in the experiment?
b. How is the limiting reactant determined in the experiment?
2. Experimental Procedure, Part A.2. What is the procedure and purpose of digesting the precipitate?
3. Two special steps in the Experimental Procedure are incorporated to reduce the loss of the calcium oxalate precipitate. Identify the steps in the procedure and the reason for each step.
Explanation / Answer
1. (a). The reactants present in the experiment are -
CaCl2.2H2O - Molar mass = 147.0146 g/mol
K2C2O4.H2O - Molar mass = 184.2309 g/mol
(b). The mixture is tested for an excess of calcium ion with an oxalate reagent - observed formation of a precipitate indicates the presence of an excess of calcium ion and a limited amount of oxalate ion in the salt mixture.
The mixture is also tested for an excess of oxalate ion with a calcium reagent - observed formation of a precipitate indicates the presence of an excess of oxalate ion and a limited amount of calcium ion in the salt mixture.
2. Procedure :- Heating the mixture with covering the beaker with a watch glass and warm the solution on a hot plate to a temperature not exceeding 75 oC for approx. 15 minutes. After 15 minutes remove the heat and allow the precipitate to settle. While the precipitate is settling heat 30 mL of deionized water for use as wash water.
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