Question

A solution contains 80g common salt in 320g of water. Calculate the concentration in terms of mass by mass percentage of the solution .

Answer 1

Given :

▪ Mass of salt = 80g

▪ Mass of water = 320g

To Find :

▪ Concentration of solution in terms of mass by mass percentage.

Conc. of soluTion :

✴ Name : Mass percentage

✴ Symbol : %w/W

✴ Definition : Amount of solute in grams present in 100g of solution.

✴ Effect of temperature : No effect

✴ Formula :

$\bigstar\:\underline{\boxed{\bf{\red{\%\dfrac{w}{W}=\dfrac{Mass\:of\:solute}{Total\:mass\:of\:solution}\times 100}}}}$

CalculaTion :

$\dashrightarrow\sf\:\%\dfrac{w}{W}=\dfrac{80}{80+320}\times 100\\ \\ \dashrightarrow\sf\:\%\dfrac{w}{W}=\dfrac{80}{400}\times 100\\ \\ \dashrightarrow\sf\:\%\dfrac{w}{W}=\dfrac{8000}{400}\\ \\ \dashrightarrow\underline{\boxed{\bf{\green{\%\dfrac{w}{W}=20\%}}}}\:\orange{\bigstar}$

Answer 2

$\huge{\pink{\underline{\underline{Question}}}}$

A solution contains 80 grams of common salt in 320 grams of water calculate the concentration in terms of mass by mass percentage of solution .

$\huge{\purple{\underline{\underline{Answer}}}}$

Given,

Mass of salt = 80g

Mass of water = 320g

Formula:-

$\% \frac{w}{w} = \frac{mass \: of \: solute}{total \: mass \: of \: solution} \times 100$

$\% \frac{w}{w} = \frac{80}{80 + 320} \times 100$

$\% \frac{w}{w} = \frac{80}{400} \times 100$

$\% \frac{w}{w} = \frac{8000}{400}$

$\% \frac{w}{w} = 20\%$

so,

The concentration in terms of mass by mass percentage of the solution is 20℅.

Additional information:-

$\% \frac{w}{w} \: is \: mass \: percent$

⭐️units on the top and bottom of the fraction must be same.

Mass concentration:- grams of dissolved substance per litre of solution.

It is the ratio of the mass of the solute present in the solution to the volume of the solution.