AP CHEMISTRYUNIT 5 TEST1.
Use the calibration curve shown above to answer the following questions.a) After creating this calibration curve, a sample containing an unknown concentration of MnO4-was analyzed and found to have an absorbance of 0.50. What is the approximate concentration of the unknown soluton? b) A student noticed that the absorbance for the 0.14 M solution did not fall exactly on the trend line for the experiment. He suggested that the error was due to dirt, or fingerprints, on the test tube used in the colorimeter. Do you agree or disagree with the student? Justify your answer.2. Write balanced net-ionic equationsfor the following reactions.a) Liquid bromine is added to a solution of sodium iodide.b) A solution of sodium phosphate is combined with a solution of calcium chloride.c) Calcium metal is added to a solution of aluminum nitrate.
2 HC2H3O2 (aq)+ Sr(OH)2 (aq)2 H2O (l)+ Sr(C2H3O2)2 (aq)3.
Answer the following questions about the reaction above.