Question

A student obtains the following data: Mass of empty, dry graduated cylinder: 20.134 g Volume added of NaCl solution: 6.744 mL Mass of graduated cylinder NaCl solution: 33.393 g What is the density of the solution?

Answer 1

d = 1.966 g/mL

Step-by-step explanation:

The expression to calculate the density of any compound is:

d = m/V

We want to know the density of the NaCl, and for that we weight a graduated cylinder, empty.

Then, we measure 6.744 mL of the salt, which would be the volume of NaCl.

And then, we weight the whole system and the value is 33.393 g.

We only need the mass of the NaCl, but if we have the mass of the whole system and the mass of the cylinder, we can calculate the mass of NaCl:

mNaCl = mSys - mCyl

mNaCl = 33.393 - 20.134

mNaCl = 13.259 g

Now that we have the mass we can calculate the density:

d = 13.259/6.744

d = 1.966 g/mL

This is the density of the salt.