Question

Read the passage given below and answer the following questions. (3)
Concentration of a solution is the amount of solute present in a given amount of solution.
Solutions having small amounts of solute are called dilute solutions and the solutions
having large amounts of solute are called concentrated solutions. The concentration of a
solution is also defined as mass of solute (in grams) present in given mass of the solution.
Concentration of a solution can be measured in terms of mass by mass, mass by volume
and volume by volume percentages. A solution where no more quantity of solute can be
dissolved at a given temperature is called a saturated solution whereas a solution in which
more quantity of solute can be dissolved at a given temperature is known as an unsaturated
solution.
(a) If 36 g of solute is dissolved in 100 g of solvent at 293 K, what will be the concentration
of the solution at this temperature?
(b) How can you convert a saturated solution into an unsaturated solution?
(c) Calculate the mass by volume percentage of a solution containing 50 g sugar in 500 mL
solution.

Answer 1

Answer:

a. 26.47

b. A saturated solution is that which is dissolved as much solute as it is capable of dissolving. By heating the solution a saturated solution can be changed into an unsaturated solution. Without adding any solvent it can be changed into an unsaturated solution.

c. Mass ofsolute = 50g

mass fsolvent = 3509

mass of solution = 50 + 350 = 400g

mass by mass% = mass of solute / mass of

solution

mass by mass = 50/400 * 100

= 100/8

= 12.5%

mass by mass % = 12.5%

Therefore the concentration percentage is

12.5%.

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