How to balance chem.eq. with crystal water?

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Discussion Overview

The discussion revolves around balancing a chemical equation involving iron (Fe) and sulfuric acid (H2SO4) to produce iron(II) sulfate heptahydrate (FeSO4*7H2O). Participants explore the implications of including water of crystallization in the reaction and how to balance the equation correctly, considering the stoichiometry and the presence of water in the solution.

Discussion Character

  • Homework-related
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant proposes the initial equation Fe + H2SO4 => FeSO4*7H2O but expresses uncertainty about balancing the hydrogens and oxygens associated with the crystal water.
  • Another participant suggests adding water molecules to the left side of the equation to account for the reaction occurring in a solution, implying that this is necessary for producing hydrated salt.
  • A follow-up question arises about whether hydrogen ions should be added to the right side of the equation, indicating a consideration of the acid-base nature of the reaction.
  • One participant notes that the reaction is fundamentally similar to other metal-acid reactions and encourages checking previous notes or resources for guidance.
  • A participant mentions difficulty in finding resources that include crystallization water, indicating a gap in their understanding due to the complexity of the topic as they are taking multiple chemistry courses.
  • Another participant emphasizes the importance of mole ratios and suggests that the reaction can be balanced without including hydrogen ions, while also prompting the calculation of moles from the given mass of iron.

Areas of Agreement / Disagreement

Participants express varying levels of confidence in their understanding of how to balance the equation, with some suggesting methods to include water of crystallization while others question the necessity of certain components like hydrogen ions. No consensus is reached on the final balanced equation.

Contextual Notes

Participants are navigating the complexities of balancing chemical equations that include water of crystallization, which may not have been covered in depth in their prior coursework. There are unresolved aspects regarding the inclusion of hydrogen ions and the exact stoichiometry of the reaction.

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Homework Statement


10 g Fe and x ml H2SO4 forms y gFeSO4*7H2O

Write a balanced chemical equation for the reaction, and determine the coeffisients y and x. The H2SO4 is 1 M.


Homework Equations


n=V*c
n=m/Fm


The Attempt at a Solution


First thing I was trying to set up the chemical eq:
Fe+H2SO4 => FeSO4*7H2O

But, I'm not sure how to balance the hydrogens and oxygens in the crystal water.

I've also calculated the how many moles 10 g of Fe is.


Any thoughts?

Thanks in advance.
 
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You need to add water molecules on the left - after all, reaction takes place in a solution. If not, there is no way hydrated salt can be produced.
 
Thanks.

But then, do I have to add hydrogen to the right?

Fe+H2SO4 + 7H2O => FeSO4*7H2O + H^+
 
Other than water of crystallization it is not different from the reaction between a metal and an acid. I am more than sure that you have covered this reaction earlier, so check your notes and the book. Googling for reaction between metal and acid will also give you the answer.
 
Thanks again. :)

I tried to Google it first, but could only find formulas without the crystallization water. So I was not sure how to handle that part. I am currently taking two different chemistry courses, one introductory and one who builds one the knowledge from the introductory course. I've never seen the *H2O part until this reaction. :)
 
Writing a balanced reaction should be no big problem. Look at the mole ratios among the parts and the materials. Post #3 reaction is almost, but not yet balanced. No matter, you can still write enough reaction without including the H+ ions.

Use given information and formula weights to account for both grams and moles.
10 grams Fe ----- How many moles?
1 to 1 mole ratio of Fe to FeSO4*7H2O ----- then how many moles and how many grams if starting from 10 grams of Fe ?
 

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