Unit 5: Acids & Bases
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1
2Name: ANSWER KEY
Chemistry 30
Unit 5: Acids & Bases
Assignment 3 – Neutralization and Titration
16 max
3
1. The substances listed in the chart below were tested with indictors methyl red, phenol red, and thymol
blue. Complete the chart indicating what colors would be seen with each indicator.
methyl red
phenol red
thymol blue
acid rain
yellow
yellow
yellow
(pH = 6.3)
ammonia water
yellow
red
blue
(pH = 11.2)
3
2. Write balanced neutralization reactions for the following:
a. the reaction between hydrobromic acid, HBr, and potassium hydroxide, KOH.
HBr + KOH → KBr + H
O
2
b. the reaction between nitric acid, HNO
and magnesium hydroxide, Mg(OH)
3
2
→ Mg(NO
2 HNO
+ Mg(OH)
)
+ 2 H
O
3
2
3
2
2
c. the reaction between phosphoric acid, H
PO
and sodium hydroxide, NaOH
3
4
+ 3 NaOH → Na
H
PO
PO
+ 3 H
O
(different answers are possible)
3
4
3
4
2
2
3. What is the molarity of a 25 mL solution of HCl that is titrated to an end point by 10 mL of a
0.200 M solution of NaOH?
HCl(aq) + NaOH(aq) → NaCl(aq) + H
O(aq)
2
M
= M
M
= 0.200
A
A
B
B
V
= 25
V
= 10
A
B
M
V
= M
V
A
A
B
B
M
(25) = (0.200) (10)
A
M
= 0.0800 M = [HCl]
answer: [HCl] = 0.0800 M
A
Unit 5: Acids & Bases
Assignment 3
Page 1 of 2
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