Question

Find the mass of caco3 required for preparation of m/10 solution of caco3 in 250 militres

Answer 1

Given :

Molarity of solution = 1/10 molar

Volume of solution = 250mL

To Find :

Mass of CaCO₃ required to prepare the solution.

Solution :

■ Molarity : Number of moles of solute dissolved in one litre (or 1000mL) of solution.

Effect of temperature : No effect

Symbol : M

Unit : mole/L

Formula :

$\dag\:\:\underline{\boxed{\tt{\orange{M=\dfrac{w\times 1000}{M_w\times V_{mL}}}}}}$

• w denotes mass of solute
• Mw denotes molar mass of solute
• V(mL) denotes volume of solution
• M denotes molarity

Molar mass of CaCO₃ : 100 g/mol

By substituting the given values;

$:\implies\tt\:\dfrac{1}{10}=\dfrac{w\times 1000}{100\times 250}$

$:\implies\tt\:0.1=\dfrac{4w}{100}$

$:\implies\tt\:4w=10$

$:\implies\sf\:w=\dfrac{10}{4}$

$:\implies\:\underline{\boxed{\bf{\purple{w=2.5\:g}}}}$