7.5 & 7.6 Chemical Analysis
Chemical Analysis
 ________analysis: identifies whether a certain
substance is present.
 ________analysis: measures the amount of a certain
substance present.
Qualitative Chemical Analysis
 ________Analysis
 The colour of solutions can indicate
the type of ion it contains.

Group 1, 2, 17 are ________
 Some metal ions produce a ________flame when
burned.
“Light” collected by a
_________________.

Qualitative Chemical Analysis
 Analysis based on ________
 Use known solubility values to create a ________that will
indicate whether a particular substance is present.
When an unknown solution is burned,
it gives off a ___ flame, indicating
the presence of aqueous _______,
calcium and/or strontium. How
could you determine which of these
ion the solution contains?
Qualitative
Chemical
Analysis
When an unknown solution is burned, it gives off a red flame, indicating

the presence of aqueous lithium, calcium and/or strontium. How could
you determine which of these ion the solution contains?
 Step 1: Test for Sr2+ – Use Rule 8
Sr2+?
No
Unknown
Solution
Unknown
Solution
(w/o) Sr2+
CrO42-
Yes
Qualitative
Chemical
Analysis
When an unknown solution is burned, it gives off a red flame, indicating

the presence of aqueous lithium, calcium and/or strontium. How could
you determine which of these ion the solution contains?
 Step 2: Test for Ca2+ – Use Rule 5
Ca2+?
No
Unknown
Solution
Unknown
Solution
(w/o) Sr2+
or Ca2+
SO42-
Yes
Qualitative
Chemical
Analysis
When an unknown solution is burned, it gives off a red flame, indicating

the presence of aqueous lithium, calcium and/or strontium. How could
you determine which of these ion the solution contains?
 Step3: Test for Li+ – Use Flame Test
Li+?
No
Unknown
Solution
Flame
Yes
Quantitative Chemical Analysis
 ________Stoichiometry: a method of calculating the
___________of substances in solution by measuring
their ________and the results of ________reactions
Quantitative Chemical Analysis
What mass of precipitate will be produced from the
reaction of 0.755L of 15%W/V sodium chloride solution
and 1.35L of 0.245mol/L silver nitrate solution?
NaCl(aq) + AgNO3(aq)
mAgCl = ?
cNaCl = 15% W/V
= 15g/100mL
vNaCl = 0.755L
CAgNO3 = 0.245mol/L
vAgNO3 =_________
NaNO3(aq) + AgCl(s)
Steps:
1. Write a ________equation (provided)
2. ________given values to amount in moles
3. Determine _________________________
4. ________given amount (of LR) in moles to
required amount in moles using _______
______ from equation
5. Convert amount in ______to required value
(mass in this case)
Quantitative Chemical Analysis
NaCl(aq) + AgNO3(aq)
Quantitative Chemical Analysis
NaCl(aq) + AgNO3(aq)
Therefore,
Quantitative Chemical Analysis
NaCl(aq) + AgNO3(aq)
We use the number of moles of AgNO3 to calculate
the mass of precipitate formed.
Therefore,
Qualitative Chemical Analysis
How could you determine if a solution contained aqueous
lead(III) and/or strontium ions?
Pb2+/Sr2+(aq)?
Rule 4
Rule 5
Pb2+?
Sr2+?
No
Yes
NaCl(aq)
Na2SO4(aq)
Yes
No
Homework
 For Monday Take-up
 Pg 309# 6-8
 Lab Manual – Concentration Practice
 For Tuesday Take-up
 Read 7.5

Make note of the Table 1 (pg 341) & Table 3 (pg 342)
 Read 7.6, Do p.353 # 3 p.355 # 1