The Following Graph Is the Standard Curve for Absorbance of an Analyte

question 19

Multiple Choice

The following graph is the standard curve for absorbance of an analyte.
In the laboratory,you are presented with a solution with an unknown concentration of the analyte.You measure the absorbance of the solution and determine it to be 0.40.Based on this standard curve,which of the following is the most accurate estimate of the analyte's concentration in the solution?

• A) 0 mg/ml
• B) 0.004 mg/ml
• C) 0.007 mg/ml
• D) 0.012 mg/ml

---

Definitions:

Real-world Conditions

Circumstances or factors that occur naturally in everyday life, outside of controlled experimental settings.

Spurious Relationships

Apparent associations between two variables that are not causally related but may be due to a third, unaccounted-for variable.

Internal Validity

Relates to experimental design. A study has internal validity when a cause-and-effect relationship between variables is clearly demonstrable and observed changes can be attributed to a defined causal variable and not to any other possible variables.