A student performs a redox titration using an ORP sensor and…

A student performs a redox titration using an ORP sensor and calculates the second derivative of the titration curve. The resulting graph begins with negative values, increases steadily, crosses the x-axis at 15.4 mL of titrant added, and then continues to positive values. What is the significance of the volume corresponding to the x-axis crossing?

A group of students is determining the percent water in a hy…

A group of students is determining the percent water in a hydrate. Four student groups report the following values for % H₂O by mass: 34.2%, 37.1%, 35.6%, 36.4% The literature value for the hydrate is 35.0% H₂O by mass. Which choice provides, in order: the range the error of the average experimental value the percent error of the average experimental value