6pints of a 20 percent solution of alcohol in water are mixed with 4 pints of a 10 percent alcohol in water solution. the percentage alcohol in the new solution is

a. 16
b. 15
c. 14
d. 13
e. 12
am i correct by saying 15?

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.

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:

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

the concentrations for the two ions

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The molarity of the stock solution of luminol

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volume of 0.100 M Na₃PO₄

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Keywords: molarity, alcohol solution,mixed solution,pints

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