Logo
Home Study Material Contact Search
AI Chat FREE
  1. sciences
  2. chemistry
  3. a sample is analyzed to determine its iron content

A sample is analyzed to determine its iron content Fe2+ via a redox titration with potassium...

Free

90.2K

Verified Solution

Question

Chemistry

A sample is analyzed to determine its iron content Fe2+ via aredox titration with potassium chromate as the titrant. In thetitration Fe2+ is oxidized to Fe3+ and CrO4 2- is reduced to Cr 3+.What is the percent by mass of iron in the sample if 0.9087g of thesample required 45.68mL of a 0.04322 M K2CrO4 solution to reach theendpoint?

I worked out the balanced equation to be:

8H+ + 3Fe2+ + CrO4 2- = 3Fe3+ + Cr3+ + 4H2O

Answer & Explanation Solved by verified expert
4.1 Ratings (790 Votes)

8H+ + 3Fe2+ + CrO4 2- = 3Fe3+ + Cr3+ + 4H2O

no of moles of K2CrO4 = molarity* volume in L

                                         = 0.04322*0.04568   = 0.00197 moles

K2CrO4 ---------> 2K+ + CrO42-

0.00197moles              0.00197moles

from balanced equation

1 mole of CrO42- react with 3 moles Fe2+

0.00197 moles CrO42- react with = 3*0.00197/1 = 0.00591moles of Fe+2

mass of Fe   = no of moles* gram atomic mass

                    = 0.00591*56 = 0.33096g of Fe

mass percentage of Fe = 0.33096*100/0.9087   = 36.42%
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

Q

5. What is the difference between the payback period and the discounted payback? 6. Define the Average...

Finance
Q

A beaker containing 50.0 ml of 0.300M Ca2+ at ph 9 is titrated with 0.150M EDTA. Calculate...

Chemistry
Q

Write the wavefunctions describing all 4 bonds in methane molecule using the VB theory.

Chemistry
Q

WRITE AN ESSAY ON THE RENIN-ANGIOTENSIN-ALDOSTERONE SYSTEM

Medical Sciences
Q

In how many ways can the numbers 0 through (2n ? 1) be arranged in 2...

Advance Math
Q

awu aleks com alekscgi x Isl e O MEASUREMENT Surface area of a cube of...

Geometry
Q

The table below contains data on the number of farms F in thousands in year...

Basic Math
Q

The proportion of students in a psychology experiment who could remember an eight-digit number correctly...

Basic Math
Q

3 Two ships are sailing from Halifax The Nina is sailing due east and the...

Calculus
Q

19. Martin Company has a...

Accounting
Q

What are the major similarities and differences between IAS 30 Disclosures in the Financial Statements...

Accounting
Q

*** I am having a hard time following the percent of sales forecast with the...

Accounting