A buffer has a pH of 7.7. If a little HCl is added to this buffer, which of the following is the most likely pH value for the mixture?
a) 2.7
b) 5.9
c) 6.1
d) 6.3
e) 7.0
f) 10.2

When HCl (strong acid) is added to this buffer system, the extra H+ ions added to the system are consumed by the NH3 to form NH4+. Now, because all the extra H+ ions are locked up and have formed a weaker acid, NH4+, thus the pH of the system does not change significantly.

What is a mixture?

Mixtures can be either homogeneous or heterogeneous: a mixture in which the components are distributed evenly, such as salt in water, is called homogeneous, while a mixture in which the components are clearly separated from each other, such as sand in water, is called heterogeneous.
A homogeneous mixture is characterized by the uniform dispersion of the components that make it up; substances exist in the same ratio everywhere in a mixture.

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A buffer has a pH of 7.7. If a little HCl is added to this buffer, which of the following is the most likely pH value for the mixture? a) 2.7 b) 5.9 c) 6.1 d) 6.3 e) 7.0 f) 10.2

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A buffer has a pH of 7.7. If a little HCl is added to this buffer, which of the following is the most likely pH value for the mixture?
a) 2.7
b) 5.9
c) 6.1
d) 6.3
e) 7.0
f) 10.2