Cell Concentration Calculation
Cell Concentration Calculation - Related Videos
02:05
Calculating Equilibrium Concentrations
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2020
Being able to calculate equilibrium concentrations is essential to many areas of science and technology—for example, in the formulation and dosing of pharmaceutical products. After a drug is ingested or injected, it is typically involved in several chemical equilibria that affect its ultimate concentration in the body system of interest. Knowledge of the quantitative aspects of these equilibria is required to compute a dosage amount that will solicit the desired therapeutic effect. A more...
02:41
Concentration Cells
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2020
A concentration cell is a type of a voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species. Consider the following voltaic cell: From the given information, the cell potential of this concentration cell can be calculated using...
01:29
Concentration Cells
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2026
A concentration cell is an electrochemical cell in which the emf arises from a difference in concentration of a species between two half-cells. Unlike galvanic cells, where electrical energy comes from a chemical reaction, the driving force here is the transfer of matter from a region of higher concentration to lower concentration. The overall process is therefore physical in nature. A classic illustration is a cell made of two chlorine electrodes operating at different chlorine gas...
02:46
Calculating the Equilibrium Constant
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2020
The equilibrium constant for a reaction is calculated from the equilibrium concentrations (or pressures) of its reactants and products. If these concentrations are known, the calculation simply involves their substitution into the Kc expression. For example, gaseous nitrogen dioxide forms dinitrogen tetroxide according to this equation: When 0.10 mol NO2 is added to a 1.0-L flask at 25 °C, the concentration changes so that at equilibrium, [NO2] = 0.016 M and [N2O4] = 0.042 M. The value of the...
02:45
Calculating pH Changes in a Buffer Solution
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2020
A buffer can prevent a sudden drop or increase in the pH of a solution after the addition of a strong acid or base up to its buffering capacity; however, such addition of a strong acid or base does result in the slight pH change of the solution. The small pH change can be calculated by determining the resulting change in the concentration of buffer components, i.e., a weak acid and its conjugate base or vice versa. The concentrations obtained using these stoichiometric calculations can be used...
FAQs
The reported concentration must account for how much the original suspension was diluted before counting. After obtaining the cell count from a known chamber volume or an automated measurement, applying the dilution factor converts the measured sample value back to the concentration of the starting suspension. Omitting this correction makes the result inconsistent with the original cell suspension.
A known chamber volume provides the reference needed to translate a cell count into cells per milliliter. The count represents only the cells present in the measured portion, so the chamber volume allows that observation to be scaled to the desired volume unit. This reference makes measurements comparable across samples and supports controlled preparation for biological experiments.
The main difference is how the cell count is obtained. A hemocytometer provides a defined chamber volume in which cells are counted, whereas an automated counter supplies the measurement through an instrument-based counting process. In either case, the resulting count must be related to volume and adjusted for dilution when necessary to determine the concentration of the original sample.
First, prepare the cell suspension and account for any dilution made before measurement. Next, count the cells in a known chamber volume or measure them with an automated counter. Convert the observed count to cells per milliliter using the relevant volume and dilution information, then use the calculated concentration to prepare a consistently sized sample for the experiment.
Measuring concentration before seeding allows researchers to place comparable numbers of cells into separate culture conditions. Consistent seeding densities reduce differences caused by unequal starting populations, making later observations easier to interpret. This is particularly important when comparing cell growth or drug responses, because the measured outcome can be evaluated against a more standardized initial condition.
In viability studies, concentration measurements help researchers prepare comparable cell samples before evaluating experimental conditions. In tissue engineering, the same information supports controlled preparation of cell-containing samples and more consistent starting populations. By documenting the number of cells introduced into each condition, investigators can better compare results across experiments involving growth, responses to treatment, or engineered tissue systems.