ion activity वाक्य
उदाहरण वाक्य
मोबाइल
- It is calibrated against buffer solutions of known hydrogen ion activity.
- For example, pH is defined as the negative logarithm of the hydrogen ion activity.
- Debye and H�ckel developed a theory with which single ion activity coefficients could be calculated.
- Single-ion activity coefficients can be calculated theoretically, for example by using the Debye H�ckel equation.
- Expressions were derived for the variation of single-ion activity coefficients as a function of ionic strength.
- This led to the development of what is now called the free-ion activity model ( FIAM ).
- PH is defined as the decimal logarithm of the reciprocal of the hydrogen ion activity, " a"
- Firstly, the cell is filled with a solution of known hydrogen ion activity and the emf, " E"
- However, chemists have never been able to give up the idea of single ion activities, and by implication single ion activity coefficients.
- However, chemists have never been able to give up the idea of single ion activities, and by implication single ion activity coefficients.
- The voltage measured between the electrodes is proportional to the logarithm of the sodium ion activity or concentration, according to the Nernst equation.
- The difference of 4 corresponds to a ratio of 10 4 of the activity, that is, vinegar's hydronium ion activity is about.
- The theoretical equation can be tested by combining the calculated single-ion activity coefficients to give mean values which can be compared to experimental values.
- Since this analysis does not take into account ion activity coefficients, the pH and molarity of a real phosphoric acid solution may deviate substantially from the above values.
- The prevailing view that single ion activity coefficients are unmeasurable independently, or perhaps even physically meaningless, has its roots in the work of Guggenheim in the late 1920s.
- If the prevailing view on the physical meaning and measurability of single ion activities is correct then defining pH as the negative logarithm of the hydrogen ion activity places the quantity squarely in the unmeasurable category.
- If the prevailing view on the physical meaning and measurability of single ion activities is correct then defining pH as the negative logarithm of the hydrogen ion activity places the quantity squarely in the unmeasurable category.
- For example, a solution with a hydrogen ion activity of 1 / ( 2 & times; 10 5 ) } } ( at that level essentially the number of moles of hydrogen ions per liter of solution ) has a pH of 5.3 } }.
- In dilute aqueous solution ( pH 0-14 ) the predominant acid species is H 3 O + and the activity coefficients are close to unity, so H 0 is approximately equal to the pH . However beyond this pH range, the effective hydrogen-ion activity changes much more rapidly than the concentration.
- Precise measurement of pH is presented in International Standard ISO 31-8 as follows : A galvanic cell is set up to measure the electromotive force ( e . m . f . ) between a reference electrode and an electrode sensitive to the hydrogen ion activity when they are both immersed in the same aqueous solution.
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