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A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added.
Consists of a weak acid and its conjugate base, or a weak base and its conjugate acid
Maintains a relatively constant pH
Used in various chemical and biological applications
Examples include acetic acid/sodium acetate buffer and phosphate buffer
The 2nd law of thermodynamics states that the total entropy of an isolated system can never decrease over time.
Entropy always tends to increase in a closed system
Heat cannot spontaneously flow from a colder location to a hotter location
The law explains why energy tends to disperse and systems tend towards disorder
Examples include a cup of hot coffee cooling down in a room, or a car engine losing energy as heat
GTZ (India) interview questions for popular designations
posted on 27 Mar 2018
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