Concentration and Dilution Calculations

Objective Measured

  • Evaluate the accuracy and reasonableness of calculations.

  • Convert numbers from standard to scientific notation format.

  • Perform calculations for preparing a weight per volume percent and percent by volume or weight solutions.

  • Perform calculations to determine the amount of solute to add to create a solution, given a final description of normality, molarity, or molality.

  • Perform calculations given a standard equation and one or more variables.

Performance Assessed

  • Individual will be asked to talk-aloud about the problem-solving approach and each step of the calculation.

  • Given a number in standard format, the individual will provide the number in scientific notation.

  • Calculations performed to determine how much solute and solvent to use to prepare a given solution. 

  • Calculations performed to determine how much solute and solvent to use to prepare a given solution.

Credential Alignment

Washington Biotechnology/Biomedical Skill Standards

  • B2 Conduct simple analyses of data and process information

  • B4 Troubleshoot experiments and equipment and perform data analysis. Mathematical formulae are correctly selected and applied. Correct data set is used. Calculations are properly documented. Data integrity is preserved. Out-of-range or out-of-specifications results are identified.


Skill Category: Applied Mathematics in Biotechnology

  • Use scientific notation, significant digits, and decimals correctly

  • Perform calculations for serial dilutions

  • Perform calculations using dilution ratios

  •  Make conversions within the metric system, and use metric measurements

– Solve Volume/Volume (V/V) and Weight/Volume (W/V) solution calculations
– Solve Molarity solution calculations
– Solve Dilution Factor calculations

Core Skill Standards for Bioscience Technicians

Critical Work Function: Perform mathematical manipulations 

Key Activities 

  • Perform calculations relating to work function

  • Given an equation, and 1 or more values, the student will be asked to solve the equation.