Question

Consider a solution which is 0.10M in NH3 and 0.20M in NH4Cl. Choose ALL of the following that are false. If a small amount of NaOH is added, the pH becomes slightly more basic. If HCl is added, the H ions react with the NH3. If a small amount of HCl is added, the pH becomes slightly more basic. If NaOH is added, the OH- ions react with the NH3. If NH4NO3 is added, the pH becomes more basic.

Answer 1

The incorrect or the false options are -

(B) - If NH4NO3 is added, the pH becomes more basic.

(D) - If a small amount of HCl is added, the pH becomes slightly more basic.

(E) - If NaOH is added, the OH- ions react with the
`NH_3`.

Step-by-step explanation:

The given solution the buffer basic .

• When a small amount of either is added, the hydrogen ion reacts with the ammonium ion, raising the pH slightly.

• When a small amount of HCl is added, the hydronium ion reacts with the ammonia, raising the pH slightly.

Therefore , the options A ( If a small amount of NaOH is added, the pH becomes slightly more basic.) and C ( If HCl is added, the H+ ions react with the NH3.) All other B , D , E are false .