1412 Exam 2 - CHEM 1412 Exam#2(Chapters 15,16 and 18 Name...

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CHEM 1412 Exam #2                                     Name:___________________ (Chapters 15,16, and 18)                                 Score : Part I -  ( 3 points each) - please write your correct answer next to each question                    number.       DO NOT CIRCLE     _____1.  Calculate the pH of a solution if it's [OH - ] = 0.000700 M and indicate               whether the solution is acidic, basic, or neutral.                a.    3.15, acidic     b.  17.2, basic      c. 10.8, basic       d.  11, basic             _____2.  Which one of the conjugate bases of the following Brønsted-Lowry                acids is  incorrect?               a.   ClO -  for HClO        b.   HS -  for H 2 S      c.   H 2 SO 4  for HSO 4 -        d.   NH 3  for NH 4 + _____3.   At normal body temperature, 37 ° C, K w  = 2.4 x 10 -14 . Calculate [H +                if [OH - ]  = 1.3 x 10 -9  M at this temperature.                 a.  1.3 x 10 -9  M       b. 1.0 x 10 -7  M      c.7.7 x 10 -6  M     d.  1.9 x 10 -5  M _____4.  Calculate the pH of a 0.025 M solution of propanoic acid               (K a  = 1.3 x 10 -5 ).                 a.  5.7 x 10 -4               b.  0.025                      c.  1.6                            d.  3.25   _____5.  Predict whether aqueous solutions of the following compounds are                acidic,  basic, or neutral. Find the incorrect answer.                a.   KNO 3 ( neutral)           b.   NaC 2 H 3 O 2 ( basic)     c.   KClO  (acidic)         d.   NaCN (basic) _____6.   Which of the following acids consider as a strong acid?                a. HCN                b. HClO 4                   c. HF                           d. HNO 2         _____7.   Does the pH increase, decrease, or remain the same on addition of                 each of  the following? (i) NaNO 2  to a solution of HNO 2 , (ii) HCl to a                 solution of  NaC 2 H 3 O 2                               a.   (i) decrease, (ii) increase        b.  (i) increase, (ii) increase                c.   (i) decrease, (ii) decrease        d.  (i) increase, (ii) decrease 1
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     _____ 8.   Calculate the pH of a solution of 0.080 M  H 2 SO 4  .
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