40.0g NaCl that is 90% by Mass, find Mass

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Discussion Overview

The discussion revolves around calculating the mass of NaCl needed to prepare a solution that is 0.90% by mass, with a total solution mass of 40.0g. Participants explore the steps and equations necessary for this calculation, focusing on the concept of mass percentage.

Discussion Character

  • Homework-related, Mathematical reasoning

Main Points Raised

  • One participant expresses uncertainty about the equations and steps required to solve the problem, indicating a need for guidance.
  • Another participant suggests considering a similar problem with a 100g solution at 10.0% by mass to help frame the approach.
  • A further suggestion is made to use the definition of mass percentage and basic algebra to rearrange the formula for the calculation.
  • A participant reports arriving at a solution of 0.36g NaCl after reflecting on the hints provided.
  • Another participant responds with a light-hearted comment, indicating a shared understanding of the initial confusion.

Areas of Agreement / Disagreement

The discussion does not reach a consensus on the specific calculation method, as participants provide hints and suggestions rather than a definitive solution. There is a shared acknowledgment of the initial confusion, but no agreement on a singular approach is established.

Contextual Notes

Participants do not explicitly outline the assumptions or definitions they are using, which may affect the clarity of the discussion. The steps to arrive at the final answer are not fully detailed, leaving some mathematical processes unresolved.

Who May Find This Useful

This discussion may be useful for students seeking assistance with mass percentage calculations and those looking for problem-solving strategies in chemistry-related homework.

BKHuff
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1. You will prepare 40.0g of a NaCl solution that is 0.90% by mass. Calculate the mass of the NaCl that is needed.


2. I don't know the proper equations/steps to find the answer, this is really what I need help with.


3. I have not made an attempt yet as I don't know how to go about making an attempt. Hopefully somebody could point me in the right direction so I can figure this out.

Also I did do a search though I was unable to find anything that seemed to deal with my situation.

-Britt
 
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Try looking at it this way first: If you needed to prepare a 100. g solution of NaCl that is 10.0% by mass, what mass of NaCl is needed?
 
Other hint: you can solve the question using just definition of mass percentage and basic algebra to rearrange the formula.
 
Last edited by a moderator:
Thanks for the help it seemed I was over thinking the question a bit. I came up with 0.36g NaCl
 
Can't say I am surpsised :smile:
 
Last edited by a moderator:

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