Acid-Base Indicator Lab Rubric Data:

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Calculations:

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Analysis:

Total Points

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AP Chemistry

Data is presented in tables, all data is recorded and the data table is clearly labeled/titled All data has the correct number of significant digits and units

1 point

Calculations are clearly labeled Equations are written in words or clearly recognized symbols for all calculations (for stoichiometry – make sure to label each factor with a unit and identify substance) Show all work for each calculation (if there are repeat calculations for several trials you may do one sample calculation and report your answer for the other calucations…make sure to label each trial) All answers must have the correct number of significant figures and units Write the three ionization equations for phosphoric acid and include the equilibrium expression Calculate the pH at the beginning of the titration Calculate the pH at the endpoint for each indicator Calculate the volume of sodium hydroxide used per mL of phosphoric acid

1 point 1 point

Experimental data is used for support Thoroughly explain the 1:2 ratio that exists in the volumes of the base. Explain why the ratio is not 1:2 if your calculated data indicates that the ratio should be different than 1:2

1 point 4 points

1 point

2 points

1 point 3 points 4 points 4 points 2 points

25 points