A Solution May Contain the Following Ions Ag⁺,Cu²⁺,Mn²⁺,Ca²⁺,and Na⁺

question 176

Multiple Choice

A solution may contain the following ions Ag⁺,Cu²⁺,Mn²⁺,Ca²⁺,and Na⁺.No precipitate formed when 0.10 M NaCl was added but a dark colored precipitate formed when H₂S was added to an acidic portion of the solution.After the removal of the solid the solution was made basic and more H₂S was added and a dark precipitate again formed.Treatment of the filtrate with (NH₄) ₂CO₃ resulted in a white precipitate.If no further tests were made then what conclusions can you draw?

• A)possible ions present Cu²⁺,Mn²⁺,Na⁺
• B)possible ions present Cu²⁺,Mn²⁺,Ca²⁺
• C)possible ions present Cu²⁺,Mn²⁺,Ca²⁺,Na⁺
• D)possible ions present Ag⁺,Cu²⁺,Mn²⁺,Ca²⁺,Na⁺

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Definitions:

Null Hypothesis

A hypothesis that there is no significant difference or effect.

Alternative Hypothesis

In hypothesis testing, the hypothesis that proposes a difference or effect, contrasting the null hypothesis.

Interaction

The effect of two or more variables combined that is different from the effect of the variables individually.

Two-way Factor ANOVA

A statistical method that evaluates the effect of two independent variables on a dependent variable simultaneously, considering interactions between factors.