relation between molarity&molality?
relation between molarity&molality?
sheik arbaz , 13 Years ago
Grade 10
Physical Chemistry> quickly...
2 Answers
TANAYRAJ SINGH CHOUHAN
Relation ship between Molarity (M) and Molality (m)
let moles os solid = nB
M = nB / V (in ml) x 1000
D(soln) = mass (soln) / V (soln)
Mass of solution = Density x Volume
d x 1000
[ Let assume of soln = 1000ml ]
M = nB / V (in ml) x 1000
M = WB / M wtB x 1000 / 1000 [ M = nB / 1000 x 1000 = nB ]
M = WB / MwtB
WB = M x MwtB
wt of solvent = wt of soln -- wt of solute
= 1000d -- M . MwtB
Molality (m) = nB / WA (gm) x 1000
m = M / 1000d -- M x MwtB x 1000 ( M = No. of moles of solute )
Here,
A = Solvent
B = Solute
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Theresh Babu Benguluri
Molarity/Molality = moles of solute/volume of solution × mass of solvent/moles of solute
= mass of solvent (in kg)/volume of solution (in litre) = mass of solvent (in grams)/volume of solution = W/V
Let the density of the solution be d g mL−1
Mass of solution = V × d
Mass of solute = number of moles × molecular mass of solute
= n mA
Mass of solvent, W = mass of solution – mass of solute
= V × d – n × mA
Thus, Molaity/Molality (M/m) = V×d–n×mA/V
Molaity (m) = molarity×V/V×d–n×mA
= molaity/d–n/V×mA
m = molaity/d–molaity×mA THERESH
Approved Last Activity: 13 Years ago
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