Assignments:
1. A basic solution can be defined as one in which
a. [H3O+] is not present
b. [H3O+] is equals to OH-
2. Which one is a self indicator?
a. K2Cr2O7
b. Cr2(SO4)2
c. KMnO4
d. H2C2O4.2H2O
3. Which of the following combinations can't produce a buffer solution?
a. HNO2 & NaNO2
b. HCN & NaCN
c. HClO4 & NaClO4
d. NH3 & (NH4)2SO4
e. NH3 & NH4Br
4. What is the pH of a solution composed of 0.20 M NH3 & 0.15M NH4Cl?
a. 2.15
b. 4.65
c. 8.26
d. 9.38
e. 8.89
5. Calculate the ratio [CH3COOH]/[CH3COONa] that gives a solution with pH=5.00?
a. 0.28
b. 0.36
c. 0.44
d. 0.56
e. 0.63