1)Consider the following balanced redox reaction in acidic medium: 2Cr(OH)3 (s)

Question

1)Consider the following balanced redox reaction in acidic medium: 2Cr(OH)3 (s) + 6ClO- (aq) + 2H+ (aq) ---> 2CrO4^2- (aq) + 3Cl2 (g)

a) What is the oxidizing agent?

b) Which element increases in oxidation number?

c) What species contains the element with the highest oxidation number?

d) What would the balanced redox reaction be in basic medium?

2) Silver nitrate is mixed with sodium hydroxide in one container , and lithium sulphate is mixed with sodium hydroxide in another container. After reaction time is allowed you found that one of the solutions stayed clear and the other one changed to a milky suspension. Identify the tyoe of reaction that is occuring in the reaction that changed, also give a balanced reaction equation for the reaction that changed.

Explanation / Answer

Solved first question with four subparts as per Chegg guidelines, post multiple question to get the answer to the second problem

1) 2Cr(OH)3 (s) + 6ClO- (aq) + 2H+ (aq) ---> 2CrO4^2- (aq) + 3Cl2 (g)

a) oxidizing agent = it is element/compound which is getting itself reduced in the reaction

In this reaction, Cl is going from oxidation state of +1 to 0, hence Cl is an oxidizing agent

b) Cr increases in oxidation number, before reaction it is present in +3 oxidation state and change to +6 after the reaction

c) Species is CrO4(2-) it contains Cr with highest oxidation state of +6

d) Oxidation Hald Reaction

Cr(OH)3 + 5OH- -------> CrO4(2-) + 4H2O + 3e-

6ClO- +- 6H2O + 6e- -------> 3Cl2 + 12OH-

Multiply reaction 1 by 2 and reaction 2 by 1 we get

2Cr(OH)3 (s) + 6ClO- (aq) + 2H2O (aq) ---> 2CrO4^2- (aq) + 3Cl2 (g) + 2OH-

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.