Does Change in NaCl Concentration Indicate Ion Quantity?

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SUMMARY

The forum discussion centers on the relationship between NaCl concentration and ion quantity, specifically through conductivity measurements. It establishes that conductivity correlates with NaCl concentration, approximately 0.5 conductivity per concentration unit. The user calculates the molarity of NaCl at different concentrations, concluding that a change in concentration can be expressed in molarity (M), but not as an absolute number of ions. The discussion highlights the importance of understanding units in chemistry.

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  • Familiarity with the molar mass of NaCl (58.44 g/mol)
  • Basic principles of ion dissociation in aqueous solutions
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Chemistry students, laboratory technicians, and anyone interested in understanding the relationship between ion concentration and conductivity in solutions.

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Homework Statement



For instance I have NaCl. I found a relationship between conductivity of NaCl in water and concentration of NaCl in the water. It's; conductivity is approx 0.5 concentration

Is it correct that the change in concentration gives the number of ions?

For example say I start off with conductivity of 100 microsiemens/cm and a concentration of 50 mg/L for the NaCl. At the end let's say I have 50 microsiemens/cm and a concentration of 25 mg/L.

25 mg/L = 0.025 g/L = 4.3 x 10^-4 Mol/L = 4.3 x 10^-4 M using the molar mass of NaCl of 58.44 g/Mol

Is the change in ion concentration 25 mg/L = 4.3 x 10^-4 M?

Or can you get an "actual" number change for example a change of 1000 ions let's say. Or is change in ion concentration always generally put in terms of M?

Thanks
 
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leviathanX777 said:
I found a relationship between conductivity of NaCl in water and concentration of NaCl in the water. It's; conductivity is approx 0.5 concentration

Have you ever heard about units?

leviathanX777 said:
Is it correct that the change in concentration gives the number of ions?

No idea what you are talking about, but no.

For example say I start off with conductivity of 100 microsiemens/cm and a concentration of 50 mg/L for the NaCl. At the end let's say I have 50 microsiemens/cm and a concentration of 25 mg/L.

25 mg/L = 0.025 g/L = 4.3 x 10^-4 Mol/L = 4.3 x 10^-4 M using the molar mass of NaCl of 58.44 g/Mol

Is the change in ion concentration 25 mg/L = 4.3 x 10^-4 M?

Or can you get an "actual" number change for example a change of 1000 ions let's say. Or is change in ion concentration always generally put in terms of M?

Sorry, what you wrote makes completely no sense to me.
 

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