solution and cencentration package

Question 1

(st)What is a homogeneous mixture?

Answer 1

is made of substances that cannot be
distinguished from one another.

Question 2

(st)What is a solvent?

Answer 2

a substance that can dissolve other substances.

Question 3

(st)what is solubility

Answer 3

The solubility of a substance is the maximum amount of solute that can be
dissolved in a certain amount of solvent. May factors such as pressure, type of solvent
or solute, and temperature influence solubility.

Question 4

(st)10g of salt is dissolved in 55mL of water. Determine the solution’s
concentration in g/L.

Answer 4

c=m/v 10/0.055L =181.82

Question 5

(st)What does ppm used for?

Answer 5

When the amount of solute is extremely small, the concentration can be expressed in
parts per million. Therefore, 1ppm 1g of solute is diluted into 1 000 000mL of solution.

Question 6

(St)What mass of solute is needed to make 500mL of a solution with a
the concentration of 350ppm?

Answer 6

350g/1000000=0.175g

Question 7

(est)For an experiment, a researcher wants to prepare 5 L of a 0.5 mol/L
solution of MgCl2. How much solute will she need to prepare her solution?

Answer 7

47.61g

Question 8

What volume of solution is needed when 0.0045g of solute is used to make a
solution with a concentration of 120ppm?

Answer 8

37.5mL