A PH 956 Buffer Was Prepared by Mixing 2

question 85

Multiple Choice

A pH 9.56 buffer was prepared by mixing 2.00 moles of ammonia (Kb for ammonia is 1.8 × 10^-5) and 1.00 mol of ammonium chloride in water to form a solution with a volume of 1.00 L. To a 200.0 mL aliquot of this solution was added 10.0 mL of 10.0 M sodium hydroxide. What was the resulting pH?

• A) 9.28
• B) 9.56
• C) 9.95
• D) 10.50
• E) 13.7

---

Definitions:

Naturalistic Observation

Research method in which behavior is studied in natural settings without intervention or manipulation.

Observer Bias

A form of bias that occurs when the presence or expectations of the observer inadvertently influence the behavior of subjects or interpretation of data.

Techniques

Specific methods or ways of doing something, usually referring to a skill or craft.

Correlation

A statistical measure that indicates the degree to which two or more variables fluctuate together.