A Stock Solution of HNO₃ Is Prepared and Found to Contain

question 110

Multiple Choice

A stock solution of HNO₃ is prepared and found to contain 12.7 M of HNO₃.If 25.0 mL of the stock solution is diluted to a final volume of 0.500 L,the concentration of the diluted solution is ________ M.

• A)0.254
• B)1.57
• C)0.635
• D)635
• E)254

---

Definitions:

Observer Bias

The tendency of observers to see what they expect to see.

Observer Effect

The phenomenon where the act of observing or measuring a system affects the system itself.

Observer Effect

The observer effect refers to changes that the act of observation can make on a phenomenon being observed.

Representative Sample

A subset of a population that accurately reflects the members of the entire population.