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Please help me ! Redox stoichiometry?
a 0.245 mol/L silver chloride solution is mixed with 50.0 mL of 0.200 mol/L zinc iodide solution. what volume of silver chloride solution is needed for a complete reaction? (answer is 81.6mL)
Ag+ is the strongest OA,
I- is the strongest RA
2Ag+2e-->2Ag(s)
2I- -->2e+I2
2Ag+2I- -->2Ag(s)+I2
0.200*(50/1000)=0.01
0.01/2 *2=0.01
0.01/0.245=
40.8mL
But the answer is 81.6mL, which part is wrong??
ty!
But this question is in redox stoichiometry, how come you use the chemical equation? Not redox equation?
1 Answer
- 1 decade agoFavorite Answer
The chemical equation for the reaction is
2AgCl + ZnI2 ---> 2AgI + ZnCl2
No of moles of zinc iodide solution used
= Molarity x Volume / 1000
= 0.2 x 50 / 1000
= 0.01 mol
From the equation,
1 mol of zinc iodide solution react with 2 mol of silver chloride solution.
Hence, 0.01 mol of zinc iodide solution react with 0.02 mol of silver chloride solution.
Volume of silver chloride solution needed
= No of moles / Molarity x 1000
= 0.02 / 0.245 x 1000
= 81.6 mL
You are advisable to use chemical equation to solve stoichiometry problems to avoid careless mistakes.
