Question

What measurement occurs last when collecting data to determine the percentage by mass of a solution?

The mass of the evaporating dish

The mass of the evaporating dish and sample

The mass of the evaporating dish and residue

The mass of the solvent

Answer 1

When determining the percentage by mass of a solution, the mass of the solvent is measured last.

What is the percentage by mass of a solvent?

The percentage by mass of a solvent in a solution is the ratio of the mass of the solvent and the mass of the entire solution.

Mathematically, this can be expressed as:

Percentage by mass of solvent = mass of solvent/mass of solution x 100

Thus, given a solution, a weighing balance, an evaporating dish, and a burner:

• The mass of the evaporating dish is determined first (A)
• The mass of the evaporating dish and the solution next (B)
• Next would be to heat the solution to remove the solvent.
• The mass of the evaporating dish plus the residue is then measured (C).

Thereafter, the amount of solvent can then be determined as: (A+B) - C.

More on percentage by mass can be found here: https://brainly.com/question/16885872

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