Question

The concentration of solution by volume percentage method is 25% when 20ml of acetone is added to x ml of solvent. Then the value of x is?

Answer 1

Answer:

Calculate the number of moles of solute present.

Moles of NaOH = 15.0 g NaOH × 1mol NaOH40.00g NaOH = 0.375 mol NaOH

Calculate the number of litres of solution present.

Volume = 225 mL × 1L1000mL = 0.225 L soln

Divide the number of moles of solute by the number of litres of solution.

Molarity = 0.375mol0.225L = 1.67 mol/L

Answer 2

$20 \times \frac{25}{100} then \: divide \: 20 \: to100 \: and \: then \: wega \\ et \: we \: get \: 4 \times 25 = 100 \: and \: your \: answer \: is \: 100$