Question

how much gram of 10% salt solution needs to add for 80g of 20% salt solution that obtain 14% salt solution?​

Answer 1

So here, concentration of solution =20%

Mass of solute( common salt)=80g

Now, we can take amount of water as x .

So, mass of the solvent = (80+x)

We know, concentration of solution = (mass of solute/mass of solution)×100

So from the equation we get,

20=(80/80+x)×100

80+x=80×5 ( we devide the both side by 20)

x= 400-80

x=320

So the anwer is, 320g of water should be added to 80g of common salt to obtain 20% salt solution..