Question

How much water should be
added to 15g of salt
to obtain 15% solution?​

Answer 1

Answer:

I think it is 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