Chemistry · Ionization of water, pH scale, common ion effect, hydrolysis of salts and pH of their solutions, the solubility of sparingly soluble salts, solubility products and buffer solutions
Assertion Assertion: A solution of in water is acidic in nature. Reason Reason :
Assertion Assertion: A solution of \( N H_{4} C l \) in water is acidic in nature. Reason Reason : Ammoniun ions undergo hydrolysis to form \( N H_{4} O H \)
- A. If both the assertion and reason are true and reason is the correct explanation of assertion.
- B. If both the assertion and reason are true but reason is not the correct explanation of assertion
- C. If assertion is true but reason is false
- D. If both assertion and reason are false
Step-by-step solution
NH4Cl is a salt of a weak base (NH3) and a strong acid (HCl). In water, NH4+ undergoes hydrolysis: NH4+ + H2O ⇌ NH3 + H3O+, producing H3O+ ions, thus the solution is acidic. The reason states that ammonium ions hydrolyze to form NH4OH, which is an older representation but essentially describes the same process leading to acidity. Hence, both assertion and reason are true, and the reason correctly explains the assertion.
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