Question

When $BaC{l_2}$ is dissolved in water when ${P^H}$ of the aqueous solution is:
A) 7
B)>7
C) <7
D) 14

Answer 1

Hint: ${P^H}$ Of the solution is defined as the negative logarithm of Hydrogen ion concentration and salts of strong acid and strong base is neutral. pH is a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.

Complete answer:
$BaC{l_2}$ is the ionic compound and it is an electrolyte that undergoes dissociation in water and gives ions and is able to conduct electricity.
This salt is formed by the ionic bond. An ionic bond is formed due to the transfer of electrons. So Barium is a metal which presents in the second group and also called as alkaline earth metal. So the second group element has two electrons in its valence shell. To get octet configuration, the barium loses two electrons and forms a divalent electropositive ion. Chlorine belongs to the VII group so it is halogen and the valency shell is having seven electrons. To get stability Chlorine gains electrons lost by Barium. Then chlorine becomes an electronegative ion, the same as it is one more chlorine participates and gains the second electron. Both barium and chlorine having opposite charges and attracts forms the Barium chloride.
So Barium chloride is an ionic compound and it is salt. When the salt dissolves in water and it solubilizes in water because of water is having an equal ratio of ${H^{ + \;}}\;and\;O{H^ - }$ and Barium chloride dissociates and forms $B{a^ + }\; and \;C{l^ - }$so the charges get nullified and there is no hydrogen concentration and no hydroxyl ion concentration has been observed. So the given salt dissolved in water and becomes neutral
Now let’s check given options
The first option is 7, that means ${P^H}$ =7 it indicates neutral
The second option is >7 that means ${P^H}$>7 it indicates the substance is basic
Third option < 7 that means ${P^H}$<7 it indicates the substance is acidic
The fourth option is 14 that means ${P^H}$=14, it indicates strong basic
So the above salt is formed by the reaction of strong bases such as Barium hydroxide and strong acid such as hydrochloric acid, so the barium chloride is a neutral salt.

Hence answer is (A) is 7.

Note:An aqueous solution is one in which the solvent is liquid water. Aqueous solution means it always contains water as solvent and Barium chloride is salt and it easily dissolves in water and produces ions.