Question

Which salt dissolved in water forms a solution of pH greater than 7.00?
a)NaCl. b)Na2CO3. c) CuSO4. d) NH4Cl​

Answer 1

Answer:

option (d)NH4CI

Explanation:

Salt of strong acid and weak base produces acidic solution 

So,  NH4Cl⇒(NH4OH+HCl )                                                S.A

others are made from (S.A+S.B) ⇒ Neutral in H2O

Thus, only NH4Cl will produce acid solution.

Hope it's helpful

Answer 2

Answer:

The H⁺ ion concentration's negative logarithm is known as pH. As a result, the definition of pH is justified as the strength of hydrogen.

Explanation:

Salt of strong acid and a weak base produces an acidic solution

Salt of a weak acid and strong base produces a solution

Because the acid is strong and the base is weak, the salt of a strong acid and a weak base is acidic with a pH value of less than 7.

Because the base in the salt of a weak acid and a strong base is strong, the pH of the whole solution will be greater than 7.

When ammonium chloride is dissolved in water, the pH of the resulting solution is not 7. This is because ammonium ions accept protons from water molecules, leaving free OH⁻ ions in the solution. This result in an increase in the hydroxide ion in the solution which leads to the pH of the solution being greater than 7.

In other reactions, there is no increase in the concentration of hydroxide ion in the whole solution so the pH does not become greater than 7.

Hence, the correct option is (d) NH₄Cl.

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