Question

chapter :- Solutions

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Answer 1

★Given:-

• A solution is obtained by mixing 300g of 25% solution and 400g of 40% solution by mass .

★To find:-

• Calculate the mass percentage of the resulting solution.

★Solution:-

300g of 25% solution contains solute:-

Mass of solute (1)= 300g × 25/100

                           = 75g

400g of 40% solution contains solute:-

Mass of solute (2)= 400g ×40/100

                            = 160g

Total mass of solute=75+160

                                 = 235g

Given 300g & 400g solution is used

Therefore,

Total mass of solution=300 + 400

                                   = 700g

Using the formula,

✦Percentage composition by mass of solute = mass of solute / total mass of solution ×100

Where we have:

• Mass of solute = 235
• Total mass of solution = 700

Putting values,

Percentage composition of solute in solution after mixing:-

⇒235/700 ×100

⇒33.57%

Percentage composition of solvent in solution after mixing:-

⇒ 100 - 33.5

⇒ 66.43%

________________

Answer 2

Explanation:

$\huge \bull \underline \boldsymbol{ \pink{Answer:-}}$

• Chapter : Solution

Solute :

The components present is lesser amount than components in solution is called solute.

Solvent:

The components present is greater amount than components in solution is called solvent.

Solution:

Solution = solute + solvent

Properties of solution:

• A solution consists of a single phase
• Eg :Monophasic system

$\boldsymbol{†Formula \: \: Used†}$

$\boldsymbol \pink{ \dfrac{Weight \: \: of \: \: solute}{Weight \: \: of \: \: solution} \: \times 100}$

Mass percentage of solute in the solution,

$\implies \sf \: { \dfrac{Weight \: \: of \: \: solute}{Weight \: \: of \: \: solution} \: \times 100}$

$\implies \sf \: \dfrac{ \dfrac{300 \times 25}{100} + \dfrac{400 \times 40}{100} }{300 + 400} \times 100$

$\implies \sf \: \dfrac{ \dfrac{23500}{100} }{700} \times 100$

$\implies \sf \: \frac{235}{7}$

$\implies \sf \green{\:33.57 \: percent}$

•°• Mass Percentage of solute in solution is 33.57%

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