Chemistry, 26.01.2020 21:31 jdkrisdaimcc11

There are 3 beakers each of which contains saline solution.
beaker a initially contains 3 liters of 10\% salt solution.
beaker b initially contains 2 liters of 20\% salt solution.
beaker c initially contains 4 liters of 0\% salt solution.

two liters are transferred from a to b and the result is thoroughly mixed. then one liter is transferred from b to c and the result mixed. finally two liters are transferred from c back to a. what is the percentage concetration of salt in a after all this?

percentage concentration of salt in a= \%

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Answer from: leinee

Percentage concentration of salt in A = 5.3%

Explanation:

Assume all the concentrations are expressed in volumetric terms, i.e 10% = 10 liter salt / 100 liter solution, 20% = 20 liter salt / 100 liter soluton, 0% = 0 liters salt.

1) First transformation: 2 liters are from A to B

Solution A:

Concentration: 10 % salt ⇒ 10 liter salt / 100 liter solutionVolume of solution: 3 litersVolume of salt: 3 liters × 10 liter / 100 liters = 0.300 liter saltVolume of water: 3 liters - 0.300 liters = 2.700 liters solvent

Solution B:

Concentraion: 20%Volume of solution: 2 literVolume of salt: 2 liter × 0.20 = 0.4 liter saltVolume of water: 2 liter - 0.4 liter = 1.6 liter water

Resultant mixture in beaker B: 2 liters of solution A plus 2 liters of solution B

Salt: 2 liter × 0.10 + 2 liter × 0.20 = 0.20 + 0.4 = 0.6 liter salt

Water: 2 liter × 0.90 + 2 liter × 0.80 = 3.40 liter waterSolution: 2 liter + 2 liter = 4 liter solutionConcentration: 0.6 liter salt / 4 liter solution = 0.15 = 15%

2) Second transformation: 1 liter transferred from B to C

Salt: 1 liter × 0.15 + 0 = 0.15 liter salt

↑ ↑

(from B) ( in C)

Solution: 1 liter + 4 liter = 5 liter solutionConcentration: 0.15 liter salt / 5 liter solution = 0.03 = 3.0%

3) Third transformation: 2 liters are from C to A.

Salt: 0.03 liter salt × 2 liter solution + 1 liter × 0.10 = 0.16 liter salt

↑ ↑

(from C) (in A)

Solution: 2 liter + 1 liter = 3 liter solution% of salt in A = (0.16 liter salt / 3 liter solution) × 100 =5.3 %

Answer from: Quest

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.

Answer from: Quest

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

Which of the following best illustrates the role that gravity played in the formation of the solar s

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There are 3 beakers each of which contains saline solution.
beaker a initially contains 3 lite...