Donald needs to produce 5000 milliliters of 32% alcohol solution. At his disposal he has 40% alcohol solution and 20% alcohol solution. How much of each does he need in order to produce his desired solution?

The answer to your question is 3 L of solution 40% and 2 L of solution 20%

Explanation:

Data

Final volume = Vf = 5000 ml = 5 L

Final concentration = Cf = 32%

Concentration 1 = C1 = 40%

Concentration 2 = C2 = 20%

Volume 1 = x

Volume 2 = 5 - x

Process

1.- Write an equation to solve this problem

     VfCf = C1V1 + C2V2

2.- Substitution

    32(5) = 40x + 20(5 - x)

3.- Solve for x

     160 = 40x + 100 - 20x

     160 - 100 = 40x - 20x

               60 = 20x

               60/20 = x

               x = 3

     Then, Volume 1 = 3 L

4.- Find Volume 2

     Volume 2 = 5 - 3

     Volume 2 = 2 L

air quality

poor drinking water

and heavy polution

can lead to poor health

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e