Solutions and Aqueous Reactions Lecture Notes

Solutions and Aqueous Reactions
Lecture Notes


mass (g)
*
mol ⑭mol/L conversion

molar mass volume set up




calculating
Solution Concentration Practice Problem 8 I .




the of by adding 45 4g of NaNO3 to create volume
calculating molarity a solution made .




of total 2 SOL
.
NaNOz molar mass

45 /mol NaNOs
M =
45 .
49
.

4g = 0 21 L
.
23 +14 +
16(3)

859 85g/mol
-


1) ol
=
2 50L 2 501
-
=
.
.




Practice Problems 8 .
2 Using Molarity in Calculations


how L of 0 125 M NaOH solution contain O 255 mol NaOH ?
many a . .




molarity
=
0 .
125 --
0 125.
mol/L

0 255 mol NaOH
. 14 - 2 04 L
.




-

0 125 mol NaOH
.




how many grams of sucrose are in 1 55L
.
of 0 758 M
. sucrose solution ?

sucrose : CH220 , "molar mass
=
12(12) + 22 + 16(11) = 342 g/mol
1 551
.
0 758mol
.
3429 = 401 8 .
+
4029
14 1 mol z




Practice Problem 8 3 .




to what volume should
you dilute 0 2001
.
of a 15 O M
.
NaOH solution to obtain a 3 00 M NaOH
.




solution ?

M
, =
13 0 M NaOH 15 0 M (0 200L)
Ve
. .
.

=


v, =
0 200L
. 3 00 M
.




My = 3 00 M NaOH
. Vz =
1 00 L
.




2
Vz =?