Question

1. How much water should be added to 15g of salt to obtain 15% salt solution? (1)
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Answer 1

Answer:

100

Explanation:

900

Answer 2

Answer:

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