Chapter 9 - Calculations Used in Analytical Chemistry Flashcards
It is a method to measure how much a chemical substance absorbs light
Spectrophotometry
How does Spectrophotometry work?
It measure the intensity of light as the beam of light passes through sample solution
Basic principle of Spectrophotometry
Each compound absorbs or transmits light over a certain range of wavelength
Wavelength of visible light
~400 nm to ~700 nm
It is an unchanging measure of the quantity of matter
Mass (m)
It is the force of gravitational attraction between that matter and Earth
Weight (w)
A ______ _____ is always based on _____ so that the results will not depend on ______
- chemical analysis
- mass
- locality
It is a precision weights used to calibrate weighing instruments and ensure accurate measurements
Calibration Weights
Calibration weights is used to
calibrate weighing instruments and ensure accurate measurements
Four fundamental ways to express solution concentration
- Molar concentration
- Percent concentration
- Solution-diluent volume ratio
- p-functions
It is the number of moles of that species that is contained in 1 L of the solution
Molar concentration (cx)
Molar concentration (cx) formula
cx = nx/V
molar conc. = no. moles solute/volume of liters
Unit of molar concentration
molar (M)
Molar (M) dimensions
mol/L, or mol L ^ -1
Molar concentration is also the number of
millimoles of solute per milliliter of solution