The percentage alcohol in the new solution is : 16%(A)
The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight / volume,), molarity, molality, parts per million (ppm) or mole fraction. Concentration shows the amount of solute in a unit of the amount of solvent.
Molarity (M)
Molarity shows the number of moles of solute in every 1 liter of solution.
[tex] \large {\boxed {\bold {M ~ = ~ \frac {n} {V}}} [/tex]
Where
M = Molarity
n = Number of moles of solute
V = volume of the solution
MIXING SOLUTIONS
Molarity of the mixture of 2 solutions:
Vm Mm = V1. M1 + V2. M2
so that:
[tex]\displaystyle Mm =\frac{V1.M1+V2.M2}{Vm}[/tex]
where :
Mm = Mixed molarity (M)
Vm = V1 + V2 = mixed volume (ml)
6 pints of a 20 percent solution of alcohol in water are mixed with 4 pints of a 10 percent alcohol in water solution.
V1=6 pints = 2.83906 liters, and concentration M1 =20% = 0.2
V2=4 pints = 1.89271 liters, M2=10% = 0.1
Vm = 2.83906 + 1.89271 = 4.73177 Liters
[tex]\displaystyle Mm=\frac{V1.M1+V2.M2}{Vc}\\\\Mm=\frac{2.83906.0.2+1.89271.0.1}{4.73177}\\\\Mm=0.16=16\%[/tex]
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Keywords: molarity, alcohol solution,mixed solution,pints
