What is the principle of pH measurement?
What is the principle of pH measurement?
A pH meter is used to determine the acidity or alkalinity of the solution. pH is the concentration of hydrogen ions in the solution. A solution containing more H+ ions remains acidic while the solution containing more OH- ions remains alkaline….Follow Pharmaguideline.
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Which electrode is used in pH meter?
silver chloride electrode
The silver chloride electrode is most commonly used as a reference electrode in pH meters, although some designs use the saturated calomel electrode.
What does a pH of 7 indicate?
pH is a measure of how acidic/basic water is. The range goes from 0 – 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pHs less than 7 are acidic while pHs greater than 7 are alkaline (basic).
What is unit of pH meter?
A pH meter is an instrument used to measure acidity or alkalinity of a solution – also know as pH. pH is the unit of measure that describes the degree of acidity or alkalinity. It is measured on a scale of 0 to 14. If the H+ concentration is greater than OH-, the material is acidic; i.e., the pH value is less than 7.
Is KCl acidic or basic?
The ions from KCl derive from a strong acid (HCl) and a strong base (KOH). Therefore, neither ion will affect the acidity of the solution, so KCl is a neutral salt.
What is slope in pH calibration?
pH Calibration Slope. The calibration slope is a conversion that the pH meter uses to convert the electrode signal in mV to pH. The meter determines the slope by measuring the difference in the mV reading of two different buffers and divides it by the difference in pH of the buffers.
What is pH calibration?
A pH calibration is the process of adjusting your pH meter by measuring solutions of a known pH value. This is because the characteristics of your electrode will change over time and this needs to be compensated for. A calibration does this by matching your pH meter to the current characteristics of your pH sensor.
What are the conditions for standard pH measurement?
Standard measurement Laboratory measurements are generally made with a conventional combination electrode. Usually the following conditions exist: The measuring range is between pH 2 and pH 12, the temperature between 10 °C and 50 °C, and the ion concentration between 0.5 and 4 mol/L.
What is the first instrument used to measure pH?
It can be said that the human tongue is the first pH measuring instrument, but only the poten- tiometric pH measurement provides an accurate and reproducible result, when the acidity or alkalinity of an aqueous solution has to be determined.
What is the purpose of the measuring electrode in a pH scale?
3.2.1 The Measuring Electrode The purpose of the measuring electrode is to determine the pH value of an aqueous solution. The platinum/hydrogen electrode was originally used to measure the hydrogen ion concentra – tion in aqueous solutions (since 1897) and today still serves as a reference standard for the elec – trometric pH determination.
What is the purpose of this pH measurement booklet?
Even in laboratories is the demand for a highly accurate and repeatable pH measurement a predominating factor. The purpose of this booklet is to supply the basic knowledge of the pH measurement in a brief and understandable form.