Question

What is the molality of a 26% NaCl? The density of solution is 1.20 g/mL

Answer 1

It's important to include the units of the "26%".. if it's 26% w/v (weight by volume) NaCl means that for every 100 mL of solution, 26 g are NaCl (the rest is water).

Find the total mass of 100 mL using the density, find the moles of NaCl then use this formula:


\(\sf molality=\dfrac{moles~of~solute}{kg~of~solvent }\)