EXAM ACID- BASE

1.  The following substances are classified as acid, except….

a.       HCl

b.      CH₃COOH

c.       NH₃

d.      SO₂(OH)₂

e.       P(OH)₃

2.  If the solution has a pH = 5 P and Q solution has pH = 6, the concentration of hydrogen ions in a solution of Q will be inversely as…..

a.       1 : 0,1

b.      1 :2

c.       1 : 10

d.      5 : 6

e.       log 5 : log 6

3.   Known to stretch several indicators change color from below.

Indicator	Color Change
Methyl orange Methyl red Brom thymol blue fenolftalein	pH: 3,1           -             4,4       Red                   orange pH: 4,4        -             6,2       red                  yellow pH: 6              -             7,6       yellow                   blue pH: 8,3           -             10      not colour         red

     

      A solution with a pH tested four different indicators of the results are as follows. 1. with methyl orange: orange 2. with methyl red: yellow 3. with brom thymol blue: blue 4. with phenolphthalein: colorless tested the pH of the solution is ....

a.       6

b.      7

c.       8

d.      9

e.       10

4.  The water acts as a base in the following reaction is…

      a.   H₂O + NH₃     ⇄       NH₄+  +  OH^-

      b.   H₂O + HS^-       ⇄      H₂S  +  OH^-

      c.   H₂O + CO₃^2-    ⇄      HCO₃^-  +  OH^-

      d.   H₂O + H₂S      ⇄       HS^-  +  H₃O⁺

      e.   A^-  +  H₂O       ⇄      HA  +  OH^-

5.   Species that act as acids and bases from the following data according to the Bronsted-Lowry is….

      1. HCO₃^-               2. H₂PO₄^-         3. NH₃             4. O₂^-

a.       1 and2

b.      3 and 4

c.       1 and 4

d.      1, 2, dan 3

e.       1, 2, 3, and 4

6.   Which include acid-base conjugate pair according to Bronsted-Lowry is…

a.       HF and HCl

b.      H₃PO₄ and HPO₄^2-

c.       NH₄OH and NH₄⁺

d.      SO₄^2- and H₂SO₄

e.       CH₃COOH and CH₃COO^-

 7.   Compounds that can be amfiprotik according to Bronsted-Lowry theory is…

a.       H₂SO₄

b.      HCO₃^-

c.       PO₄^3-

d.      NO₄^-

e.       HCl

8.   Among the following reaction takes place is…..

a.       FeS_(s)  +  HCl_(aq)

b.      AgCl_(s)  +  H₂SO_4(aq)

c.       CaCO_3(s)  +  NaNO_3(aq)

d.      HgI_2(s)  +  KCl_(aq)

e.       KCl_(aq)  +  NaNO_3(aq)

9.   Among these substances which include a weak acid is….

a.       HF

b.      HCl

c.       HBr

d.      HI

e.       HNO₃

10. If an HCl acid is reacted with a base KOH will produce….

a.       H₂O

b.      KCl

c.       H₃O⁺

d.      KCl  +  H₂O

e.       Cl^-

Answer Key

1. a                  2. e                  3. b                  4. d                  5. d

6. e                  7. b                  8. e                  9. e                  10. d