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What are two random errors and two systematic errors that could potentially occur when taking the...

What are two random errors and two systematic errors that could potentially occur when taking the pH of a solution (intended to have a pH of 7.20) woth a pH probe, but you end up reading a different pH value (6.90)?
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1. Systematic errors: These types of errors are observed due to instrumental, methodological or human mistakes that cause deviation from actual value. E.g (i): Error in the calibration of pH meter and

(ii) Error in the reading of pH meter may cause a lower reading of pH 6.90.

2. Random errors: These errors are caused due to uncontrollable flactuations in variables that affect experimental results. E.g:

(i): Decrease in pH caused due to random increase in atmosphere temperature of laboratory.

(ii):Stirring error

(iii): Liquid junction potential error.  

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