Chapter 4.1-4.4
Supplemental Instruction
Iowa State University / Leader: / Kia
Course: / CHEM 177
Instructor: / Anand
Date: / February 10th, 2017

Concept Check

1.  Give an example for each of the following

  1. Monoprotic
  2. Diprotic
  3. Triprotic

2.  Indicate whether each of the following is a strong, weak, or non-electrolyte

  1. C12H22O12
  2. HClO2
  3. AlCl3
  4. H2SO4

3.  What is the difference between oxidation and reduction?

4.  True or False, if false correct to make it true J

  1. An example of a metathesis reaction is

HNO3(aq) + KOH(aq) à H2O(l) + KNO3(aq)

  1. In the following precipitation reaction the insoluble material is Ca(NO3)2

CaI2 + 2 AgNO3 à Ca(NO3)2 + 2 AgI

  1. Aqueous solution means water is the solvent

Practice Problems

5.  Write the molecular equation, total ionic and net ionic for the following (careful!)

  1. __ HBr + __ KOH à
  1. __ NaHCO3 + HBr à
  1. __ HNO2 + __ NaOH à

6.  Determine the oxidation number for the indicated element in each of the following substances:

  1. S in SO2
  1. C in COCl2
  1. Mn in KMnO4
  2. Br in HBrO
  1. P in PF3
  1. O in K2O2

Challenge question

7.  A fertilizer railroad car carrying 34,400 gal of commercial aqueous ammonia (30% ammonia by mass) tips over and spills. The density of the aqueous ammonia solution is 0.88 g/cm3. What mass of citric acid, C(OH)(COOH)(CH2COOH)2, (which contains three acidic protons) is required to neutralize the spill? 1 gal=3.785 L.

8.  Hydrogen cyanide, HCN, is a poisonous gas. The lethal dose is approximately 300 mg HCN per kilogram of air when inhaled.

a.  Calculate the amount of HCN that gives the lethal dose in a small laboratory room measuring 12 x 15 x 8.0 ft. The density of air at 26 deg. C is 0.00118 g/cm3.

b.  If the HCN is formed by reaction of NaCN with an acid such as H2SO4, what mass of NaCN give the lethal dose in that room?