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  2. Potentiometric titration - Wikipedia

    en.wikipedia.org/wiki/Potentiometric_titration

    In analytical chemistry, potentiometric titration is a technique similar to direct titration of a redox reaction. It is a useful means of characterizing an acid. No indicator is used; instead the electric potential is measured across the analyte, typically an electrolyte solution.

  3. Electroanalytical methods - Wikipedia

    en.wikipedia.org/wiki/Electroanalytical_methods

    Therefore, the difference in potential between the two electrodes gives an assessment of the sample's composition. In fact, since the potentiometric measurement is a non-destructive measurement, assuming that the electrode is in equilibrium with the solution, we are measuring the solution's potential.

  4. Ion-selective electrode - Wikipedia

    en.wikipedia.org/wiki/Ion-selective_electrode

    The most common types of reference electrodes used in analytical chemistry include the standard hydrogen electrode, the saturated calomel electrode, and the Ag/AgCl electrode. [ 3 ] The standard hydrogen electrode (SHE) is the primary reference electrode that has a potential of 0 volts at all temperatures and a pressure of 1 atm.

  5. Potentiometer (measuring instrument) - Wikipedia

    en.wikipedia.org/wiki/Potentiometer_(measuring...

    A potentiometer being calibrated and then measuring an unknown voltage. R 1 is the resistance of the entire resistance wire. The arrow head represents the moving wiper.. In this circuit, the ends of a uniform resistance wire R 1 are connected to a regulated DC supply V S for use as a voltage divider.

  6. Potentiometer - Wikipedia

    en.wikipedia.org/wiki/Potentiometer

    Linear taper potentiometers [4] are used when the division ratio of the potentiometer must be proportional to the angle of shaft rotation (or slider position), for example, controls used for adjusting the centering of the display on an analog cathode-ray oscilloscope. Precision potentiometers have an accurate relationship between resistance and ...

  7. Isothermal titration calorimetry - Wikipedia

    en.wikipedia.org/wiki/Isothermal_Titration...

    The profile of the curve is determined by the c-value, which is calculated using the equation: c = n K a M {\displaystyle c=nK_{a}M} where n {\displaystyle n} is the stoichiometry of the binding, K a {\displaystyle K_{a}} is the association constant and M {\displaystyle M} is the concentration of the molecule in the cell.

  8. pH meter - Wikipedia

    en.wikipedia.org/wiki/PH_meter

    Portable, or field pH meters, are handheld pH meters that are used to take the pH of a sample in a field or production site. [19] In-line or in situ pH meters, also called pH analyzers, are used to measure pH continuously in a process, and can stand-alone, or be connected to a higher level information system for process control.

  9. List of unsolved problems in chemistry - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    RNA folding problem: Is it possible to accurately predict the secondary, tertiary and quaternary structure of a polyribonucleic acid sequence based on its sequence and environment? Protein design : Is it possible to design highly active enzymes de novo for any desired reaction?