The purity of the salt Sn3(PO4)2 (546.0727), was determined by the redox titration with KMnO4. Half reactions involved: Unbalanced half reactions: MnO4- ↔ Mn2+ Sn2+ ↔ Sn4+ a) Balance the redox reaction given above. b) Write the fundamental equation for the redox stoichiometry between Sn2+ and MnO4- Before analysis, KMnO4 solution was standardized according to the following procedure: 1.000 g of 100% pure tin, Sn (118.71) wire was used. After proper chemical treatment, a volume of 29.75 mL of the permanganate solution was used in the titration of the reduced tin. c) Calculate the concentration of the KMnO4 solution. An as received sample of the salt Sn3(PO4)2 (546.0727) weighing 5.0550 g was dissolved in water. The samp
The purity of the salt Sn3(PO4)2 (546.0727), was determined by the redox titration with KMnO4. Half reactions involved:
Unbalanced half reactions: MnO4- ↔ Mn2+
Sn2+ ↔ Sn4+
a)
b) Write the fundamental equation for the redox stoichiometry between Sn2+ and MnO4-
Before analysis, KMnO4 solution was standardized according to the following procedure: 1.000 g of 100% pure tin, Sn (118.71) wire was used. After proper chemical treatment, a volume of 29.75 mL of the permanganate solution was used in the titration of the reduced tin.
c) Calculate the concentration of the KMnO4 solution.
An as received sample of the salt Sn3(PO4)2 (546.0727) weighing 5.0550 g was dissolved in water. The sample was treated to completely reduce all the tin to Sn2+. This solution was then titrated with standard KMnO4 (158.03) (calculated in (c)). 40.00 mL of the standard KMnO4 solution was used in the titration to reach the equivalence point.
d) What is the purity of the salt in terms % Sn3(PO4)2 in the as received sample?
Assuming Sn3(PO4)2 is a stable salt, it was subjected to a drying process. As received sample weighing 3.000 g was placed in the oven in a tared moisture-free beaker. After drying, the dried sample weighed 2.6585 g.
e) Calculate % moisture of Sn3(PO4)2.
f) What is the purity of the salt in terms % Sn3(PO4)2 in the dried sample?
If Sn3(PO4)2 solution is to be subjected to argentometric titration,
g) Write the balanced titration reaction. (products are Ag3PO4(s), other ions are spectator ions)
h) Write the stoichiometric relationship (fundamental eqn) between the titrant (AgNO3) and the titrand (Sn3(PO4)2.
i) Is this a feasible titration technique? Why?
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