A Buffer Is Prepared by Adding 150 ML of 1

question 22

Multiple Choice

A buffer is prepared by adding 150 mL of 1.0 M NaOH to 250 mL of 1.0 M NaH₂PO₄. How many moles of HCl must be added to this buffer solution to change the pH by 0.18 units? If necessary, assume the total volume remains unchanged at 400 mL.

• A)0.025 mol HCl
• B)0.063 mol HCl
• C)0.082 mol HCl
• D)0.50 mol HCl
• E)1.0 mol HCl

---

Definitions:

Testing Circumstances

The specific conditions or settings under which tests or evaluations are conducted, impacting outcomes and interpretations.

Future Studies

An interdisciplinary field that seeks to anticipate and analyze possible, probable, and preferable futures.

Scientific Hypothesis

A testable prediction or explanation for a specific phenomenon, based on observation, reasoning, or existing scientific knowledge, serving as a starting point for further investigation.

Disproved

Shown to be false or incorrect through evidence or logical argument.