How Many mg/l Are in a 3% Sodium Hypochlorite Solution?

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Discussion Overview

The discussion revolves around calculating the concentration of Sodium Hypochlorite in a 3% solution, specifically how many mg/l are present. The context includes aspects of chemistry related to solution concentration and properties.

Discussion Character

  • Homework-related
  • Technical explanation

Main Points Raised

  • One participant requests assistance in calculating the mg/l of Sodium Hypochlorite in a 3% solution, seeking detailed workings.
  • Another participant suggests that the question belongs in the Homework Problems section.
  • A participant raises concerns about the composition of commercially manufactured Sodium Hypochlorite solutions, noting potential decomposition into sodium chloride and sodium hydroxide, and emphasizes the need for the solution to be alkaline to prevent rapid decomposition into chlorine.
  • It is mentioned that calculating the formula weight of Sodium Hypochlorite (NaClO) and knowing the specific gravity or density of the solution are necessary for the calculation.
  • One participant proposes that for a 3% solution, it can be approximated that the density is similar to that of water.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the specifics of the calculation or the implications of the solution's composition, indicating multiple viewpoints and uncertainties remain.

Contextual Notes

There are limitations regarding the assumptions about the density of the solution and the potential presence of other compounds due to decomposition or manufacturing conditions.

wilsonctj
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Hi

I need to work out how many mg/l of Sodium Hypochlorite there are in a 3% Solution

Any help (inc workings) would be greatly appreciated!

Regards

Chris
 
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This goes in the Homework Problems section.
 
Is this for a commercially manufactured solution? Sodium hypochlorite decomposes and may yield sodium chloride as it decomposes, or maybe there is sodium chloride and also sodium hydroxide as a result of the manufacturing conditions. Note, the solution needs to be alkaline otherwise will decompose very quickly into chlorine. You can calculate for yourself the formula weight of NaClO and you may need the density or specific gravity of the solution, which you should measure yourself.

basically what I only meant to say was, you calculate the formula weight of the compound, and you also need to have a measurement of the specific gravity or density; then you can calculate what you asked.
 
Last edited:
3% solution is diluted enough so that you may - as a first approximation - safely assume its density is that of water.

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