January 2012 Chemistry Regents #63-65

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50 Questions 51-54 Questions 55-57 Questions 58-59 Questions 60-62 Questions 63-65 Questions 66-69  Questions 70-71  Questions 72-74 Questions 75-78  Questions 79-81  Questions 82-85

Question

Base your answers to questions 63 through 65 on the information below.   In a titration, a few drops of an indicator are added to a flask containing 35.0 milliliters of HNO3(aq) of unknown concentration. After 30.0 milliliters of 0.15 M NaOH (aq) solution is slowly added to the flask, the indicator changes color, showing the acid is neutralized. 63 The volume of the NaOH(aq) solution is expressed to what number of significant figures? [1] HIGHLIGHT TO SEE THE ANSWER 3 (Based on 30.0 mL of NaOH ) 64 Complete the equation in your answer booklet for this neutralization reaction by writing the formula of each product. [1] HIGHLIGHT TO SEE THE ANSWER NaNO3 + H2O  or H2O + NaNO3 65 In the space in your answer booklet , show a numerical setup for calculating the concentration of the HN03(aq) solution, [1] HIGHLIGHT TO SEE THE ANSWER MA(35.0mL)=(0.15M)(30.0ml)   on to Questions 66-69

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