Question

Define molarity with proper formula and its unit and calculate molarity if 4.9gm of sulphuric acid

mixed with 250 ml of solution​

Answer 1

Solution :-

(1) Molarity

Molarity is defined as the moles of solute present in 1 dm³(1L) volume of solution

➽ Molarity = moles of solute (mol) / Volume of solution ( L)

The unit of molarity is mol / dm³ or mol / L

(2)

As per the given data ,

• Mass of H2SO4 (W)= 4.9

• Molar mass of H2SO4(M) = 2(H) + S + 4(16) = 2 + 32 +64 = 98 g

• Volume of solution = 250 ml = 0.25 L

First let us find the moles of H2SO4

➽ n = W / M

➽ n = 49 / 98

➽ n = 2

Now ,

➽ Molarity = 2  / 0.25

➽ Molarity = 200 /25

➽ Molarity = 6 M

The molarity of the solution is 6 M