Question

1. what was the sum of the mass your separated components? 0.612 g nacl recovered + 1.067 g nh₄cl evaporated + 2.445 g sand recovered = 4.124 g total. compare this with the original mass of the mixture and list at least three specific reasons why the sum of the mass of your three individual components might not add up to equal the original mass. (user error is not an acceptable answer.)

Explanation:

Step1: Identify the masses

We have the masses of recovered components: $0.612$ g of NaCl, $1.067$ g of NH₄Cl (evaporated), and $2.445$ g of sand.

Step2: Calculate the sum

Sum the masses: $0.612 + 1.067+2.445=4.124$ g.

Step3: List reasons for mass - difference

1. Some of the substances may have undergone chemical reactions during separation, forming new compounds not accounted for in the measured masses. For example, NH₄Cl may have decomposed further under heat during evaporation and the products escaped.
2. There could be losses due to adhesion. Some of the substances might have stuck to the walls of the containers or filtration equipment during the separation process.
3. Volatilization of volatile components. Even substances that are not highly volatile at room - temperature might have some degree of volatility during heating steps in the separation process, leading to mass loss.

Answer:

The sum of the separated components is $4.124$ g. Reasons for the mass - difference: chemical reactions, adhesion, and volatilization.