A Lab Technician Adds 0

question 81

Multiple Choice

A lab technician adds 0.015 mol of KOH to 1.00 L of 0.0010 M Ca(NO₃) ₂. K_sp = 6.5 *10¯⁶ for Ca(OH) ₂. Which of the following statements is correct?

• A) Calcium hydroxide precipitates until the solution is saturated.
• B) The solution is unsaturated and no precipitate forms.
• C) The concentration of calcium ions is reduced by the addition of the hydroxide ions.
• D) One must know K_sp for calcium nitrate to make meaningful predictions on this system.
• E) The presence of KOH will raise the solubility of Ca(NO₃)₂.

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Definitions:

SSE

Sum of Squared Errors; a measure used in statistical data analysis to assess the differences between observed and predicted values.

SST

Total Sum of Squares, an overall measure of the variation within a dataset relative to a mean value.

Least Squares Estimate

A method of estimating the parameters in a statistical model by minimizing the sum of squared differences between observed and predicted values.

Slope

The measure of the steepness or incline of a line, often calculated as rise over run in the coordinate plane.