Assignment 7: Acids and Bases

This assignment will give you practice with the math introduced in Lesson 7 as well as information covered in the pH and alkalinity labs.   When necessary, you should use atomic weights rounded to the hundredths place.  Units should be abbreviated - "mg" not "milligrams", and "L" not "liter". 

  1. The formula for sulfuric acid is _______________________.

    HNO3
     HCl
     H2SO4
     HClO4


  2. What is the normality of a 5.3 M solution of nitric acid?

    5.3 N
    6.3 N
    10.6 N
    15.9 N


  3. What is the molarity of a 0.4 N solution of calcium hydroxide?

    2 M
    0.2 M
    0.4 M
    0.133 M


  4. You add 27 g of phosphoric acid to 0.5 L of water. What is the normality of the resulting solution?

    0.6 N
    0.8 N
    1 N
    2 N


  5. You need to produce 2.0 L of a 1 N solution of sodium hydroxide. How much sodium hydroxide do you need to use?

    20 g
    40 g
    80 g
    120 g


  6. You have a stock solution of 1 N acetic acid. You want to dilute the acid to produce 1 L of 0.2 N acetic acid. How much of the stock solution do you need to use?

    0.2 L
    1 L
    1.2 L
    5 L


  7. You use 340 mL of a 2.0 N solution of hydrochloric acid to create 1.0 L of a more diluted solution. What is the normality of the diluted solution?

    0.17 N
    0.68 N
    2.34 N
    680 N


  8. You dilute a 0.2 N solution of ammonia using 11 mL of a stock solution to create 1 L of the diluted solution. What is the concentration of the diluted solution, in mg/L?

    2.2 mg/L
    35 mg/L
    77 mg/L
    80 mg/L


  9. You have a 100% solution of hydrochloric acid. What is the normality of this solution?

    27.4 N
    36.5 N
    54.9 N
    82.3 N


  10. "Acid rain" is made acidic primarily by the presence of sulfuric acid. In one region, the concentration of sulfuric acid in the rain was found to be 2.0 ppm. What is the normality of the rain?

    0.000020 N
    0.000041 N
    0.000061 N
    none of these


  11. What is the percent concentration of a 5 N solution of sodium hydroxide?

    0.2%
    10%
    20%
    30%



    This section of the assignment deals with the pH virtual lab.
  12. Before calibration the electrode needs to be rinsed with distilled water.

    True
    False


  13. ___________________ is injected into the sample by the aid of the injector located at the top of the electrode.

    Aluminum hydroxide
    Dichloramine
    Potassium chloride
    Sodium bicarbonate


  14. The LED readout will show _____________________ when the meter is first turned on.

    P 0.0
    P 1.7
    P On
    P Ready


  15. The final pH reading for the virtual lab is ___________________ at __________________.

    7.2 at 12.6°C
    7.9 at 12.6°C
    7.9 at 12.8°C
    8.1 at 12.9°C



    This section of the assignment deals with the alkalinity virtual lab.
  16. The operator adds 4 drops of ___________________ to the sample.

    B-120
    B-170
    B-190
    B-200


  17. After adding the above chemical the sample turned __________________.

    light green
    light blue
    dark green
    dark blue


  18. When the titrator knob is turned, _____________________ is released into the beaker.

    hydrochloric acid
    carbonic acid
    sulfuric acid
    sodium chloride


  19. You have reached the end point when the color reaches a ___________________.

    light green color
    bright red color
    bright blue color
    weak tea color


  20. The final reading to reach the end point was ___________________ for the virtual lab.

    1.9 mg/L
    3.0 mg/L
    3.2 mg/L
    3.8 mg/L