1) In the above redox reaction, use oxidation numbers to identify the element ox
ID: 540027 • Letter: 1
Question
1)
In the above redox reaction, use oxidation numbers to identify the element oxidized, the element reduced, the oxidizing agent and the reducing agent.
2)
In the above redox reaction, use oxidation numbers to identify the element oxidized, the element reduced, the oxidizing agent and the reducing agent.
3)
In the above reaction, the oxidation state of chlorine changes from ___ to ___
How many electrons are transferred in the reaction? ___
4)
In the above reaction, the oxidation state of chromium changes from ___-7-6-5-4-3-2-10+1+2+3+4+5+6+7 to ___-7-6-5-4-3-2-10+1+2+3+4+5+6+7
How many electrons are transferred in the reaction?
You need to make an aqueous solution of 0.231 M magnesium acetate for an experiment in lab, using a 250 mL volumetric flask. How much solid magnesium acetate should you add?
grams
6)
How many milliliters of an aqueous solution of 0.136 M potassium chloride is needed to obtain 5.01 grams of the salt?
mL
7) In the laboratory you dissolve 16.1 g of calcium bromide in a volumetric flask and add water to a total volume of 500. mL.
H2C2O4 + NO3-+ H+HNO2 + 2CO2+ H2OExplanation / Answer
1) H2C2O4 + NO3-+ H+ ----> HNO2 + 2CO2+ H2O
NO3^-(ox.state of N = +5) and HNO2(ox.state of N = +3)
OX.number of N, changes from +5 to +3, it involves in reduction.so that NO3^- acts as oxidising agent.
H2C2O4(OX.number of C = +3) and CO2(OX.number of C = +4)
OX.number of C, changes from +3 to +4, it involves in oxidation.so that H2C2O4 acts as redusing agent.
2) 3SO42- + Cl-+ 6H+ -----> ClO3- + 3SO2+ 3H2O
SO42-(ox.state of S = +6) and SO2(ox.state of S = +4)
OX.number of S, changes from +6 to +4, it involves in reduction.so that so4^2- acts as oxidising agent.
Cl^-(OX.number of Cl = -1) and ClO3^-(OX.number of Cl = +5)
OX.number of Cl, changes from -1 to +5, it involves in oxidation.so that Cl acts as redusing agent.
3) OX.number of Cl, changes from -1 to +5,
No of electrons transfered in the reaction = 6
4) 10Cr3+ + 6IO3-+ 17H2O ----> 5Cr2O72- + 3I2+ 34H+
OX.number of Cr, changes from +3 to +6,
No of electrons transfered in the reaction = 30
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