(Aqueous solution of same concentration
of which substance has the highest
ph value ?
(a) HCl
(b) H₂SO4
(C) NHGOH
(dl NaOH
Answers
Answer:
pH=log
[H
+
]
1
pH is inversely proportional to hydrogen ion concentration. As concentration of H
+
decreases, pH increases and vice-versa. Ammonium chloride (NH
4
Cl) is a salt of weak base and strong acid. So, its aqueous solution will be acidic as
NH
4
Cl+H
2
O→
weakbase
NH
4
OH
+
strongacid
HCl
So, pH of NH
4
Cl is less than 7.
NaNO
3
(Solution nitrate) is the salt of strong acid and strong base. So, its aqueous solution is neutral as
NaNO
3
+H
2
O→
strongbase
NaOH
strongacid
HNO
3
So, pH of NaNO
3
is 7.
CH
3
COOK (Potassium acetate) is a salt of strong base and weak acid. Its aqueous solution will be basic and pH value will be
>7≈8.8
CH
3
COOK+H
2
O→
weakacid
CH
3
COOH
+
strongbase
KOH
Na
2
CO
3
(Sodium carbonate) is a salt of strong base and weak acid. Its aqueous solution is also basic and its pH value will be more than 10.
Na
2
CO
3
+H
2
O→
strongbase
2NaOH
+
weakacid
H
2
CO
3
Explanation: