How to name a solution's parts and calculate percent and molar concentration, the two ways the HESI A2 Chemistry subtest asks you to describe how much solute is in a solution.
ObjectiveC.3.1Read4 minExam weightQuantitative Chemistry ≈ 24% of Chemistry
This lesson is part of the full Study Guide
Unlock every lesson, unit, and quiz across every subject. The Chemistry quantitative chemistry unit is included.
Name the solute and solvent in a mixture and classify it as dilute, concentrated, or saturated.
Calculate percent concentration (weight per volume, volume per volume, weight per weight) from a word problem.
Calculate molarity and use the dilution equation to find a missing concentration or volume.
What the lesson concludes
A solution is a homogeneous mixture: one substance (the solute) is dissolved throughout another (the solvent), and you cannot see the two parts separately.
Percent concentration expresses solute per 100 parts of solution, most often as weight per volume (g per 100 mL) for a solid dissolved in a liquid.
Molarity (mol/L) counts particles rather than mass, which is why medication and lab values often report both a percentage and a molar or millimolar concentration.
The dilution equation, concentration one times volume one equals concentration two times volume two, lets you find any one of four values once you know the other three.
Saline and dextrose fluids on a med-surg unit are everyday percent-concentration solutions, which is why this objective shows up dressed as a clinical scenario.