Question

What is molarity????

Answer 1

Hey there!

Answer!


$\textbf{Molarity}$: Molarity of a solution is defined as the number of moles of the solute dissolved per litre of the solution. I is represented as $\textbf{`M`}$. Thus a solution, which contains one gram mole of the the solution dissolved per litre* of the solution is regarded as $\textbf{one molar solution}$.

M = $\large{ \frac{Moles \: of \: solute }{Volume \: of \: solution \: in \: ml \: or \: cm ^{3} }} \times 1000$


Let this is the (1) equation.


$\textbf{Example}$:


1) Calculate the Molarity of Pure water.

Solution: Density of water = 1gm/L

Mass of 1000mL of water = Volume × Density

= 1000 × 1 = 1000g.

Moles of water = 1000/18 = 55.55 mol.

Now Using the equation ( 1 ) and 55.55 mol of H2o are present in 1000mL or 1L of water :

= Molarity = $\textbf{55.55M}$


Molarity is one of the common measures of expressing concentration which is frequently used in laboratory.


#Be Brainly.

Answer 2

Hey !!

                           MOLARITY

It is defined as number of moles of solute dissolved in one litre of solution.

                      Molarity = Moles of solute / Volume of solution (in litre)

Units of molarity is mol L⁻¹ or M (molar). Molarity changes with change in temperature as volume changes with change in temperature.

EXAMPLE

Question = A solution of glucose ( molar mass = 180 g mol⁻¹) in water is labelled as 10% (by mass). What would be the molarity of the solution ?

        ( DENSITY OF SOLUTION = 1.2 g mL⁻¹ )

Solution

              Let the mass of solution = 100 g

   Now, Mass of glucose = 10 g

Number of moles of glucose = Mass of glucose / Molar mass

              = 10 g / 180 g mol⁻¹ = 0.056 mol

Volume of the solution = Mass of solution / Density of solution

              = 100 g / 1.2 g mL⁻¹

              = 83.3 mL

           = 83.3 / 1000 L

          = 0.083 L

Molarity = Moles of solute / Volume of solution in litre

       = 0.056 mol / 0.09 kg

        = 0.62 mol kg⁻¹

FINAL RESULT ---> 0.62 mol kg⁻¹