Question

6.45 g of urea dissolved in 500 g of water . calculate the percentage solution. And also tell which type of percentage solution

Answer 1

Answer :-

Percentage concentration of the solution is 1.27 % . Also, this is mass-by mass percentage solution .

Explanation :-

We have :-

→ Mass of urea (solute) = 6.45 g

→ Mass of water (solvent) = 500 g

________________________________

Here, we are given with the masses of solute and solvent and we have to calculate the mass percentage concentration of the solution.

Firstly, let's calculate total mass of the solution.

Mass of solution :-

= Mass of solute + Mass of solvent

= (6.45 + 500) g

= 506.45 g

Mass percentage concentration :-

= (Mass of solute/Mass of solution) × 100

= (6.45/506.45) × 100

= 645/506.45

= 64500/50645

= 1.27 %

Answer 2

$\bf \bigstar \: \underline{Information \: provided \: with \: us } :$

$\rm \implies{Mass \: of \: water = 500 \: g}$

$\rm \implies{Mass \: of \: dissolved \: urea = 6.45\: g}$

$\bf \bigstar \: \underline{What \: we \: have \: to \: calculate } :$

$\rm \implies{Percentage \: of \: solution}$

$\rm \implies{Type \: of \: Percentage \: of \: solution}$

$\bf \bigstar \: \underline{We \: know\: that } :$

$\sf \bigstar \: Mass \: of \: Solution :$

$\rm \implies \: Mass \: of \: solute + \: Mass \: of \: solvent$

$\bigstar \: \bf \underline{Here}$

$\rm \star\: Mass \: of \: solute \: i.e \: mass \: of \: urea$

$\rm \implies \: 6.45\: g$

$\rm \star\: Mass \: of \: Solvent \: i.e \: mass \: of \: water$

$\rm \implies \: 500\: g$

$\bigstar \: \bf \underline{So}$

$\sf \bigstar \: Mass \: of \: Solution :$

$\rm \implies \: 6.45\: g + 500 \: g$

$\sf \implies \: 506.45 \: g$

$\bigstar \: \bf \underline{Now}$

$\rm \star\: Concentration\: of \: solution$

$\rm \implies \: \dfrac{Mass \: of \: Solute}{Mass \: of \: Solution} \times 100$

$\rm \implies \: \dfrac{6.45}{506.45} \times 100$

$\rm \implies \: \dfrac{6.45 \times 100}{506.45\times 100}$

$\rm \implies \: \dfrac{645}{50645}$

$\bf \implies \:1.27 \: \: \%$

$\bf \bigstar \: \underline{Therefore} :$

$\rm \star\: Percentage\: of \: solution$

$\bf \huge\implies \boxed{ \:1.27 \: \: \%}$

$\bigstar \: \bf \underline{Note:}$

• Here we express the concentration of a solution and the mass of a solute and the mass of a solution as given below

Mass Percent = Mass of Solute Mass of Solution × 100%

So the type of percentage solution is Mass Percent

$\bigstar \: \bf \underline{Learn-More:}$

• Solute means a substance which dissolved in a solution .Here Urea dissolves in water and therefore, So urea is the solute

• Solvent is liquid in which other materials dissolve to form a solution .Here Urea dissolves in water and therefore,So water is solvent.

• The homogeneous mixture of one or more solutes dissolved in a solvent is known as Solution .

• Here the given solution is Urea Solution