Question

The phenomenon of interaction of anions and cations furnished by an electrolyte with the $H^{+}$ and ${OH}^{-}$ ions of water of produce acidic nature or alkaline nature is known as hydrolysis. In hydrolysis:

• A. the $pH$ may either increase or decrease
• B. all the salts undergo hydrolysis
• C. the variation of $pH$ depends upon the nature of salt as well as temperature
• D. none of the above

Answer 1

Answer: (A), (C)

the $pH$ may either increase or decrease
the variation of $pH$ depends upon the nature of salt as well as temperature

"The phenomenon of the interaction of anions and cations of the salt with the hydrogen ion and hydroxide ions furnished by water yielding acidic or alkaline solution is known as salt hydrolysis.

$pH$ is defined as the concentration of proton $H^{+}$, so it depends on this concentration. If we have a system, in which the concentration changes when changing temperature, of course, $pH$ will change. Some systems can produce proton $H^{+}$ with increasing temperature, so the $pH$ value will decrease.