Stupid question

[Kratoz24x]

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What would be more concentrated. 1m NaCl or 1M NaCl?

 

[LiteBear2011]

I think they are equal.
1m NaCl = (1 mole NaCl)/(1 kg of water)
1M NaCl = (1 mole NaCl)/(1 L of water)

Since the density of water is 1g/mL, 1 kg = 1L for water; therefore, 1m = 1M if the solvent is water.
If the solvent is not water, then you need to determine the relationship of kg and L through density.

 

[Miley13]

A 1M (M = molarity) solution is more concentrated than a 1m (m = molality) solution.

This is true because in a 1M solution, you have 1 mole of the substance in 1 liter of solution. When you say 1 liter of solution, that is including the solute (substance) and solvent. So you have less than 1 liter of solvent for 1 mole of solute.

In a 1m solution, you have 1 mole of the substance in 1 kg of solvent. Since 1kg=1L, you have 1L of solely solvent and therefore more solvent than what is present in 1M. More solvent with 1 mole of substance makes 1m less concentrated than 1M.

Hope this helps!

 

[coheedutk]

1m NaCl = 1 mole of solute/ kg of solvent(water perhaps)..1 M NaCl = 1 mol/L NaCl these two are different weighs to measure the concentration and you shouldn't be comparing them.

i suck