Question

11. How much water should be added to 15 grams of salt to obtain 15 percent salt
solution ?
​

Answer 1

Answer:

85 mL

Explanation:

Given :

Mass of solute = 15 g

Mass % = 15 g

We know :

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

We can write :

Mass of solution = mass of solute + mass of solvent

Let :

Mass of solvent = y gram :

= > 15  = ( 15 ) / ( 15 + y ) × 100

= > 1  = ( 1 ) / ( 15 + y ) × 100

= > 15 + y = 100

= > y = 85 g

We know :

Density = Mass / Volume

= > Volume = mass / density :

Density of water = 1 g / mL

= > Volume = 85 / 1 mL

= > Volume = 85 mL