A Ce⁴⁺ Standard Solution Is Prepared with Primary-Standard-Grade Ammonium Hexanitratocerate(IV),(NH₄)₂Ce(NO₃)₆

question 16

Multiple Choice

A Ce⁴⁺ standard solution is prepared with primary-standard-grade ammonium hexanitratocerate(IV) ,(NH₄) ₂Ce(NO₃) ₆.Which of the follow will NOT decrease the concentration of Ce⁴⁺ in solution over time?

• A)Ce⁴⁺ solution prepared in distilled water.
• B)Ce⁴⁺ prepared in hot HCl solution.
• C)Ce⁴⁺ prepared in H₂SO₄ solution.
• D)Ce⁴⁺ prepared in HClO₄ solution.
• E)Ce⁴⁺ prepared in HNO₃ solution.

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Definitions:

Two-Way Classification Design

A research design that involves two factors (independent variables), with each factor usually having multiple levels, for the purpose of analyzing how they interact with each other in influencing a response variable.

Non-Directional Dependent Samples Z-Test

A statistical test used when comparing the means of two related samples to determine if there is a significant difference without predicting the direction of the difference.

Randomized Block Design

An experimental design that divides subjects into blocks based on a characteristic before randomly assigning treatments within these blocks to reduce variation and increase the accuracy of the results.

Degrees of Freedom

The amount of separate parameters or data points that can be attributed to a statistical distribution.