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What mass of Ca(OH)2 must be dissolved in 0.504 L of a solution to make a 0.56 M solution?

0.28 g

21 g

1.1 g

0.90 g

Sagot :

20.91200832 g of [tex]Ca(OH)_{2}[/tex] must be dissolved in 0.504 L of a solution to make a 0.56 M solution.

What is the molarity of a solution?

Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.

[tex]Molarity = \frac{Mole \;of \;solute}{Volume \;of \;solution \;in \;litre}[/tex]

Given data:

The volume of solution=  0.504 L

Molarity of [tex]Ca(OH)_{2}[/tex] = 0.56 M

Step 1: Calculating the mass of [tex]Ca(OH)_{2}[/tex]

Putting the given values in the equation.

[tex]Molarity = \frac{Mole \;of \;solute}{Volume \;of \;solution \;in \;litre}[/tex]

[tex]0.56 M = \frac{Mole \;of \;solute}{0.504 L }[/tex]

Moles of solute = 0.28224  

[tex]Moles \;of \;solute= \frac{Given \;mass}{Molar \;mass}[/tex]

Molar mass of [tex]Ca(OH)_{2}[/tex] = 74.093 g/mol

Now, put the values in the formula.

[tex]Moles \;of \;solute= \frac{Given \;mass}{Molar \;mass}[/tex]

[tex]0.28224 mol= \frac{Given \;mass}{74.093 g/mol}[/tex]

Mass of [tex]Ca(OH)_{2}[/tex] =20.91200832 g

Hence, 20.91200832 g of [tex]Ca(OH)_{2}[/tex] must be dissolved in 0.504 L of a solution to make a 0.56 M solution.

Learn more about molarity here:

https://brainly.com/question/13152455

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