Answered

Westonci.ca is your trusted source for finding answers to all your questions. Ask, explore, and learn with our expert community. Join our platform to connect with experts ready to provide precise answers to your questions in different areas. Explore comprehensive solutions to your questions from knowledgeable professionals across various fields on our platform.

A student performs redox titration between 10.0 mL of hypochlorous acid, HCIOlaq) and chromlumilll) nitrate; Cr(NO3)3aq) The half-reactions are given below: 7 Hzo() 2 Cr3+(aq) Cr2072-(aq) 14 At(aq) HcIO(aq) 2 Hi(aq) + 2 e C12(g) HzO() Give the overall balanced oxidation-reduction reaction; What is the oxidation number of chromium in Cr2o72 Give one Indication that this Is oxidation-reduction reaction: Explain your reasoning: As the reaction proceeds the solution becomes more acidic and the pH ofthe solution decreases. Explain why: The titration uses chromium(IlI) nitrate yet nitrate does not appear in the half-reaction: Explain the role of nitrate in the reaction The 10.0 mL of hypochlorous acid requires 26.5 mL of 0.120 M chromium(Ill) nitrate to reach equivalence_ Determine the initial molarity of hypochlorous acid. Determine the final molarity of Cr2072 once the reaction has gone completion: (Assume the volumes are additive )

A Student Performs Redox Titration Between 100 ML Of Hypochlorous Acid HCIOlaq And Chromlumilll Nitrate CrNO33aq The Halfreactions Are Given Below 7 Hzo 2 Cr3aq class=

Sagot :

pstnonsonjoku

From the stoichiometry of the reaction, the final molarity of Cr2O7^2- in the solution is 0.044 M.

1) The balanced reaction equation is;

4Cr^3+(aq) + 14HClO(aq) + 14H^+(aq) -----> 28H^+(aq) + 7Cl2(g) + 2Cr2O7^2-(aq)

2) The oxidation number of chromium in Cr2O7^2- is obtained as follows;

2x + 7(-2) = -2

2x - 14 = -2

2x = -2 + 14

2x = 12

x = 6

3) This is an oxidation - reduction reaction because the oxidation number of Cr increased from + 3 to +6.

4) This is because, the reaction produces hydrogen ions causing the pH to decrease.

5) Nitrate does not appear in the balanced reaction equation hence it is a spectator ion.

6) Number of moles of chromium nitrate = 26.5/1000 L × 0.120 M = 0.00318 moles

Since 4 moles of Cr^3+ reacts with 14 moles of hypochlorous acid

0.00318 moles of  Cr^3+ reacts with  0.00318 moles × 14 moles/4 moles =

0.0011 moles

Molarity of hypochlorous acid = 0.0011 moles/0.01 L = 0.11 M

7) If  4 moles of Cr^3+  yields 2 moles of  Cr207^2-

0.00318 moles of  Cr^3+ yields  0.00318 moles ×  2 moles / 4 moles

= 0.00159 moles

Final molarity of   Cr207^2- =  0.00159 moles/(10 mL + 26.5 mL) × 10^-3

= 0.044 M.

Learn more about redox reaction: https://brainly.com/question/13978139

We appreciate your visit. Hopefully, the answers you found were beneficial. Don't hesitate to come back for more information. We hope you found what you were looking for. Feel free to revisit us for more answers and updated information. Stay curious and keep coming back to Westonci.ca for answers to all your burning questions.