What Is the Concentration of SO4²⁻ When Al³⁺ Is 0.28M?

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Discussion Overview

The discussion revolves around determining the concentration of sulfate ions (SO4²⁻) in a solution of aluminum sulfate (Al2(SO4)3) given the concentration of aluminum ions (Al³⁺) is 0.28M. The scope includes a homework-related problem involving stoichiometry and ion concentration calculations.

Discussion Character

  • Homework-related
  • Mathematical reasoning

Main Points Raised

  • One participant states the concentration of Al³⁺ is 0.28M and asks for the concentration of SO4²⁻.
  • Another participant inquires about the number of moles of sulfate ions present in one mole of aluminum sulfate.
  • Several participants confirm that there are 3 moles of sulfate ions for every mole of aluminum sulfate.
  • A participant suggests using the ratio of Al³⁺ to SO4²⁻ from the formula to solve the problem.

Areas of Agreement / Disagreement

Participants generally agree on the stoichiometric relationship between Al³⁺ and SO4²⁻ ions, but the discussion remains unresolved regarding the final concentration calculation.

Contextual Notes

The discussion does not clarify the total amount of aluminum sulfate present, which is necessary for calculating the concentration of sulfate ions. There are also unresolved mathematical steps related to the concentration calculation.

Who May Find This Useful

Students working on stoichiometry problems in chemistry, particularly those involving ionic compounds and their dissociation in solution.

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Homework Statement


The concentration of Al3+ ion in aqueous solution of Al2(SO4)3 is 0.28M, Then the concentration of SO42- ion in this solution will be?


Homework Equations


Al2(SO4)3 → 2Al3+ + 3SO42-


The Attempt at a Solution


What should i compare to start of with?
 
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How many moles of sulphate ions are present in 1 mole Aluminium Sulphate?
 
3 moles, is this the answer?
AGNuke said:
How many moles of sulphate ions are present in 1 mole Aluminium Sulphate?
 
xiphoid said:
3 moles, is this the answer?

How many moles of Aluminium Sulphate do you currently have?
 
1 mole
Pranav-Arora said:
How many moles of Aluminium Sulphate do you currently have?
 
Take a look at the formula - how many moles of Al3+ and how many moles of SO42- in 1 mole of Al2(SO4)2? What is their ratio? Can you use this ratio to solve the problem?
 

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