U1L02A1 – Study Guide
Name:
AP Chemistry B
Unit 1 Lesson 2 Study Guide
Instructions: Answer the questions below. You must show all of your work in order to receive full credit
for your response. You may either type out your response or hand write your response and scan this
document to a PDF to submit it to the assignment link in Blackboard. The questions below were selected
from your textbook. Therefore, please feel free to use your textbook as a resource in answering these
questions.
15.65
What are the concentrations of HSO− 4 , SO2 −
4
and H+ in a 0.20 M KHSO4 solution?
x = [-0.0126 √(0.0126 2 -(4*1*(0.00252))]/(2*1)
x = [- 0.0126 ±√ (0.000159 + 0.0101)]/2
= 0.044
So concentration of [H+ ]= [SO42-] = x = 0.044 M
[ HSO4- ] = 0.20 - x
= 0.20 - 0.044
= 0.16 M
15.69
Predict the acid strengths of the following compounds: H2O, H2S, and H2Se.
The size of the center atom grows as follows: O S Se
As a result, the conjugate bases' order of stability is:
-OH < -SH < -SeH
Alternatively, consider conjugate basicity:
-SeH < -SH < -OH
Finally, as I already said, acid-base conjugate pairings are connected. In terms of the original acids, we may
say:
In terms of acid strength, H2Se > H2S > H2O.
(i.e. the strongest acid produced the weakest conjugate base)
15.81
Calculate the pH of a 0.36 M CH3COONa solution.
U1L02A1 – Study Guide
15.83
Predict the pH (> 7, < 7, ≈ 7) of NaHCO3 solution.
15.89
Zn(OH)2 is an amphoteric hydroxide. Write balanced ionic equations to show its reaction with
(a) HCl
(b) NaOH [the product is Zn(OH)2 − 4 ]
A) Zn(OH)2 (s) + 2 HCl (aq) → ZnCl2 (aq) + 2 H2O (l)
It is an acid base reaction.
Hcl is acid .Zn(OH)2 is base .
B) Zn(OH)2 + 2NaOH → Na2[Zn(OH)4]
The product formed is tetrahydroxozincate(II) sodium.
15.93
Classify each of the following species as a Lewis acid or a Lewis base:
(a) CO2
(b) H2O
(c) I −
(d) SO2
U1L02A1 – Study Guide
(e) NH3
(f) OH−
(g) H+
(h) BCl3