Answer to Question #164442 in Chemistry for Phyroe

Question

If 100 grams of NaOH is dissolved in water to give a solution with a volume of 250ml, what is the formality of the solution?

Answer 1

Formality expresses the concentration of a substance as moles of solute per litre of solution.

From here, the number formality equals:

F = n / V = m / (Mr × V)

where F - formality, n - number of moles, V - volume, m - mass, Mr - molecular weight.

From here:

F(NaOH) = 100 g / (40 g/mol × 0.250 L) = 10 mol/L = 10 F

Answer: 10 F