Sop ph meter pdf

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Hence the name pH. Values below 7 indicate acidity which increases as the number decreases, 1 being the most acidic. Values above 7 indicate basicity which increases as the number increases, 14 being most basic. For e g. The greater this concentration of hydrogen ions, the stronger the acid is.

The difference in electrical potential relates to the acidity or pH of the solution. Beckman invented the first commercially successful electronic pH meter and then went on to found an international scientific instruments company. Electrodes of pH meter are two half-cells an indicating pH electrode and a reference electrode.

Most applications today use a combination electrode with both half-cells in one body. Therefore a thin layer 0. Connection to the potentiometer is by means of a silver wire coated with silver chloride, which is immersed in the HCl.

The type most commonly used contains a Hg-Hg2Cl2 paste in saturated KCl; this is called calomel electrode. In both cases KCl makes contact between this unit and the solution being measured. The KCl slowly flows into the sample. What are electrochemical cell and electrolytic cell?

On the other hand, electrolytic cell is a device which converts electrical energy into chemical energy. For example, in electrochemical cell anode is negative whereas in electrolytic cell, the anode is positive.

What is galvanic cell or voltaic cell? It generally consists of two different metals connected by a salt bridge, or individual half- cells separated by a porous membrane.

Explain properties of salt bridge and its use? It maintains electrical neutrality within the internal circuit, preventing the cell from rapidly running its reaction to equilibrium. Why is KCl used? The salt bridge is required to maintain the neutrality in the system by providing enough negative ions equal to the positive ions during oxidation. These cookies will be stored in your browser only with your consent.

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