Answer :
The number of meq of Na and Cl is 0.007.
We know that 1 milliequivalent (meq) of a substance is the amount of substance equal to its molecular weight divided by the valency.
Now, Number of moles of NaCl = Mass of NaCl/Molecular weight of NaCl
Mass of NaCl = 409.5 mg = 0.4095 g .
Number of moles of NaCl = 0.4095/58.5 = 0.007 mol .
Number of meq of Na+ = Number of moles of Na+ x Valency,
Valency of Na+ = 1 (since Na+ has a valency of 1)
Number of meq of Na+ = 0.007 x 1 = 0.007 meq.
Number of meq of Cl- = Number of moles of Cl- x Valency ,
Valency of Cl- = 1 (since Cl- has a valency of 1 )
Number of meq of Cl- = 0.007 x 1 = 0.007 meq.
Therefore, the number of meq of na and cl is 0.007.
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Final answer:
To determine the milliequivalents of Na+ and Cl- in the solution, convert the mass of NaCl to moles using its molar mass, and then multiply by 1000 to convert from moles to meq. Therefore, The solution contains 7 meq each of Na+ and Cl-.
Explanation:
To find the meq of Na+ and Cl-, first we need to know the molar mass of NaCl, which is 58.5 g/mol.
Since there are 1000 mg in 1 g, 409.5 mg of NaCl is equivalent to 0.4095 g.
We then convert grams to moles by dividing by the molar mass: 0.4095 g ÷ 58.5 g/mol = 0.007 moles of NaCl.
Since NaCl dissociates into equal numbers of Na+ and Cl-, we have 0.007 moles of each ion.
To convert moles to milliequivalents, we use the fact that 1 eq of Na or Cl is the same as 1 mole, and thus 1 meq is 1/1000th of a mole.
Therefore, we have: 0.007 moles × 1000 meq/mole = 7 meq of Na+ and likewise, 7 meq of Cl-.
