Help: Analytical Chem Tritration Problem

  • Thread starter Thread starter bdanish
  • Start date Start date
  • Tags Tags
    Analytical Chem
Click For Summary
SUMMARY

This discussion focuses on solving a back titration problem involving iron concentration in a spring water sample. A 100.0 ml sample was treated with 25.00 ml of 0.002107 M K2Cr2O7, leading to the formation of Fe3+ and Cr3+ ions. The excess K2Cr2O7 was back titrated with 7.47 ml of 0.00979 M Fe2+ solution. The calculations required include determining the concentration of iron in ppm and the moles of Fe2+ needed for complete reaction with the dichromate.

PREREQUISITES
  • Understanding of back titration techniques
  • Knowledge of stoichiometry in chemical reactions
  • Familiarity with molarity and concentration calculations
  • Basic concepts of analytical chemistry
NEXT STEPS
  • Calculate the moles of K2Cr2O7 used in the reaction
  • Determine the moles of Fe2+ that reacted in the first stage
  • Learn about the principles of back titration in analytical chemistry
  • Explore methods for calculating concentration in ppm
USEFUL FOR

Chemistry students, analytical chemists, and professionals involved in water quality testing or titration methods.

bdanish
Messages
1
Reaction score
0
Can someone please help me with this back tritration problem!

a 100.0 ml sample of spring water was treated to convert any iron present to Fe2+ (AW 55.847) Addition of 25.00 ml of .002107 M K2Cr2O7 (FW294.185) resulted in the reaction:

6(Fe2+) + (Cr2O7)(2-) + 14H+ _____6(Fe3+) + 2(Cr3+) = 7H2O

the excess K2Cr2O7 was back titrated with 7.47 ml of .00979 M Fe2+ solution. Calculate the concentration (in ppm) of the iron in the sample (Recall: ppm Fe = #g Fe/10^6g sample).
 
Physics news on Phys.org
How many moles of Fe2+ are required to completely react given amount of dichromate?

How many were added during titration?

How many reacted in the first stage?
 

Similar threads

How Do You Calculate Equilibrium Concentrations in a Redox Reaction?
  • · Replies 2 ·
Replies
2
Views
4K
Calculate Mass Percent of Fe in Ore Sample
  • · Replies 2 ·
Replies
2
Views
3K
Calculating PPM Iron: Iron Titration
  • · Replies 5 ·
Replies
5
Views
10K
EDTA titration-(Analytical Chem.)
  • · Replies 6 ·
Replies
6
Views
15K