Question

A student has 100ml of 0.1 m kcl solution. to make it 0.2m he has to

Answer 1

Increasing the molarity from 0.1 to 0.2 means increasing the concentration of the solution.

Thus means increasing the amount of solute in the solution.

Molar mass of KCl = 75g / mole

Moles of KCl in 100ml of 0.1M:

(100/1000) × 0.1 = 0.01 moles

Mass = 0.01 × 75 = 0.75 g

Moles of KCl in 100ml of 0.2M

(100/1000) × 75 = 1.5 g

To raise the concentration to 0.2M, we will increase the amount of solute by :

1.5 - 0.75 = 0.75 g

Answer 2

Answer:

Explanation:

Increasing the molarity from 0.1 to 0.2 means increasing the concentration of the solution.

Thus means increasing the amount of solute in the solution.

Molar mass of KCl = 75g / mole

Moles of KCl in 100ml of 0.1M:

(100/1000) × 0.1 = 0.01 moles

Mass = 0.01 × 75 = 0.75 g

Moles of KCl in 100ml of 0.2M

(100/1000) × 75 = 1.5 g

To raise the concentration to 0.2M, we will increase the amount of solute by :

1.5 - 0.75 = 0.75 g