You are given a 0.252 g sample of a copper-containing alloy and asked to determine the
weight percent of copper. After dissolving the metal in acid, you add an excess of KI, and
the Cu2+ and I- ions undergo the reaction
2Cu2+(aq) + 5I-(aq) CuI(s) + I3-(aq)
The liberated I3- is titrated with sodium thiosulfate according to the equation
I3-(aq) + 2S2O32-(aq) S4O62-(aq) + 3I-(aq)
If 26.32 mL of 0.101 M Na2S2O3 is required for titration to the equivalence point, what is the
weight percent of Cu in the alloy?
the anwser is 67.1% but i have no idea how they figured it out
please help
weight percent of copper. After dissolving the metal in acid, you add an excess of KI, and
the Cu2+ and I- ions undergo the reaction
2Cu2+(aq) + 5I-(aq) CuI(s) + I3-(aq)
The liberated I3- is titrated with sodium thiosulfate according to the equation
I3-(aq) + 2S2O32-(aq) S4O62-(aq) + 3I-(aq)
If 26.32 mL of 0.101 M Na2S2O3 is required for titration to the equivalence point, what is the
weight percent of Cu in the alloy?
the anwser is 67.1% but i have no idea how they figured it out
please help