Logo
Home Study Material Contact Search
AI Chat FREE
  1. sciences
  2. chemistry
  3. a 49.96 ml sample containing la3+ was treated with

A 49.96 mL sample containing La3+ was treated with sodium oxalate to precipitate La2(C2O4)3, which was washed, dissolved...

Free

90.2K

Verified Solution

Question

Chemistry

A 49.96 mL sample containing La3+ was treated withsodium oxalate to precipitateLa2(C2O4)3, which waswashed, dissolved in acid, and titrated with 18.04 mL of 0.006363MKMnO4. Calculate the molarity ofLa3+ in the unknown.
(Hint: the reaction involved in the titration was: permanganateion(s) + oxalate (ions) -----> manganese(II) ions + carbondioxide. The reaction occurred in acidic aqueous solution)

Answer & Explanation Solved by verified expert
4.5 Ratings (616 Votes)

Reaction,

2MnO4- + 5C2O4^2- + 16H+ ---> 2Mn2+ + 10CO2 + 8H2O

moles of KMnO4 used = 0.006363 M x 18.04 ml

                                    = 0.1148 mmol

moles of C2O4^2- reacted = 0.1148 x 5/2

                                           = 0.287 mmol

moles of La3+ present = 0.287 x 2/3

                                     = 0.1913 mmol

molarity of La3+ in the unknown = 0.1913/49.96

                                                    = 0.00383 M
Get Answers to Unlimited Questions

Join us to gain access to millions of questions and expert answers. Enjoy exclusive benefits tailored just for you!

Membership Benefits:
  • Unlimited Question Access with detailed Answers
  • Zin AI - 3 Million Words
  • 10 Dall-E 3 Images
  • 20 Plot Generations
  • Conversation with Dialogue Memory
  • No Ads, Ever!
  • Access to Our Best AI Platform: Flex AI - Your personal assistant for all your inquiries!
Become a Member

Other questions asked by students

Finance
1.2K views

NPV Your division is considering two projects with the following cash flows (in millions): 0 1 2 3 Project A -$20 $5 $9 $12 Project B -$13 $8 $7 $3 What are...

Psychology
1.2K views

Olivia is now 23 years old and four months pregnant. One year ago she married a...

Physics
1.2K views

37 Four objects W X Y and Z each with charge q are held fixed...

Physics
1.2K views

One mole of a monatomic ideal gas is taken along two cyclic processes E F...

Basic Math
1.2K views

For the arithmetic sequence with a? =7/3 and d=-15/8Part 1 of 3(a) the first...

Algebra
1.2K views

Solve the equation for 3x 8y 24 y 3 8 x 3

Algebra
1.2K views

2 If L 2 M 3 3 N 16 P 9 which expression results in...

Accounting
1.2K views

Faith Busby and Jeremy Beatty started the B&B partnership on January 1, Year 1. The...

Accounting
1.2K views

Chillco Corporation produces containers of frozen food. During April, Chillco produced 735...

Accounting
1.2K views

10. What decision rule should be followed when deciding if a business segment should be...

Accounting
1.2K views

Selected hypothetical comparative statement data for the giant bookseller Barnes \& Noble are presented here....

Accounting
1.2K views

Ryan needs $5600 to buy an engagement ring. His friend agrees to lend him $5600...