Question

For a solution composition of 25.0 g solute and 100.0 g solvent; choose the correct numerical concentration of % (m/m). 20.0 15.0 10.0 25.0 Question 25 2 pts Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true false status of the statements using the choices. (1) 1.0 liters of a 6.0 M solution would contain 6.0 moles of solute, independent of the identity of the solute. (2) For liquid-liquid solutions, volume of the solution is always the same as the sum of the volumes of solute and solvent because of solute-solvent repulsion effects. (3) Osmotic pressure is the amount of pressure needed to prevent the process of osmosis from occurring. All three statements are true. None of the statements are true. O Only one of the statements is true. Two of the three statements are true.

Answer 1

q)

mass of solute = 25 g

mass of solvent = 100 g

mass of solution = 125 g

So 25 g of solute present in 125 g of solution.

% m/m of solute is determined by calculating mass of solute in 100 g of solution.

125 g of solution contains 25 g of solute.

100 g of solution contains how much solute = ?

So mass of solute in 100 g os solution =

$\frac{100 g}{125 g}*25 g$

= 20 g

% m/m of solute = 20 % m/m

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25)

Evaluation

(1) - By the definition of Molarity the first statement is true.

[Molarity is the number of moles of solute dissolved in 1L of solution]

(2) - Volume of solution = volume of liquid solute + volume of liquid solvent . This statement is valid for Ideal solution only. Non-ideal solution in which association and dissociation phenomenon operate , do not agree with this statement. Because of repulsive forces between solute -solvent particles the volume changes . False

( 3) --Osmotic pressure is the is the pressure that need to be applied to a solution to halt the flow of solvent molecules through a semipermeable membrane or osmosis. ( in other words) This is definition of osmostic pressure. --- True

Result ------ Only statements 1 and 3 are right . Statement 2 is not correct.

Two of the state,ents are true.