Answer this
1. A 1000 mL container of brand
A juice drink contains 250 mL of juice and 750 mL of water. A 600 mL container
of brand B juice drink contains 200 mL of juice and 400 mL of water. Which
brand of juice drink is more concentrated, brand A or brand B?
2. What is the concentration of a 500 mL solution that contains 5 mL of
solute?
3. Justin added 25 grams of solute with 75 grams of solvent. What is the
concentration of the solution?
4. What would be the percent concentration of
each of the following solutions?
a. 54.0 g of AgNO3 g is dissolved in 128 g of
water.
b.
4.22 g of K2CO3 is dissolved in 426 mL of water.
c. 0.762 g of ZnF2 is dissolved in 1.30
liters of water.
Answers
Answer:
1- Brand B juice is more concentrated.
1. Given:
A 1000 mL container of brand A juice drink contains 250 mL of juice and 750 mL of water.
A 600 mL container of brand B juice drink contains 200 mL of juice and 400 mL of water.
To find:
Is brand A or brand B more concentrated
Solution:
The Ratio of juice and water in Brand A = 250:750
= 1:3
The Ratio of juice and water in Brand B = 200:400
= 1:2
Hence, the concentration of juice is more in Brand B.
2. Given:
The Volume of solution = 500 mL
The Volume of solute = 5mL
To find:
Concentration of solute
Solution:
Volume by volume percentage = Volume of solute×100 /Volume of solution
= 5 x 100/500
= 1 %
Hence, the concentration is 1%.
3. Given:
The mass of solvent = 75g
The mass of solute = 25g
To find:
Concentration of solution
Solution:
Mass by mass percentage = Mass of solute×100 /Mass of solution
= 25 x 100/100
= 25%
Hence, the concentration is 25%.
4.
a) Given:
The mass of solvent = 128g
The mass of solute = 54g
To find:
Percent concentration of the solution
Solution:
Percent concentration of the solution = Mass of solute x 100/(Mass of solvent + solute)
= 54 x 100/(182)
= 29.6%
Hence, the concentration is 29.6%
b) Given:
The volume of solvent = 426 mL
The mass of solute = 4.22g
To find:
Percent concentration of the solution
Solution:
Percent concentration of the solution = Mass of solute x 100/Volume of solution
= 4.22 x 100/(426)
= 0.99%
Hence, the concentration is 0.99%
c) Given:
The volume of solvent = 1300ml
The mass of solute = 0.762g
To find:
Percent concentration of the solution
Solution:
Percent concentration of the solution = Mass of solute x 100/Volume of solution
= 0.762 x 100/(1300)
= 0.05%
Hence, the concentration is 0.05%