Name
likt. • (;ÿ
"ÿ- ÿ;ÿ ÿ-{'j
Date
Period
Molarity and Dilution Practice
Molarity Problems: Solve the following molarity problems. Round all answers to the correct number of
significant figures. Make sure all answers have the correct unit.
1. What is the molarity of 0.945 Lofa solution that contains 0.227 moles of Fe(NO3)3?
} /
":
}
#1 Answer:
2.
What is the molarity of a solution that contains 50.0 grams of sodium hydroxide, NaOH, in 855 mL
of solution? The molar mass of NaOH is 40.0 grams.
} "):5
.. g> : <
i{
:
"7
"
i'
#2 Answer:
i(o
" <
l 'Jÿ 7>
3. What mass of zinc nitrate, Zn(NO3)2, is needed to prepare 675 mL of 1.2o M zinc nitrate aqueous
solution?
" iiÿ' = ,9i0 7: 4:,i
/_jjs
"
.... )ÿÿ #3 Answer:
- 5
Dilution Problems: Solve the following dilution problems. Round all answers to the correct number of
significant figures. Make sure all answers have the correct unit.
.
Hydrochloric acid is obtained commercially at a concentration of 12.1 M. How many milliliters of
12.1 M HCl(aq) must be used to prepare 2.oo x to3 mL of o.500 M HCl(aq)?
"
(
;,i.>',:',
'. ' _(¢
17'l,''
....
I
,
#4 Answer:
_
T",
)'?-, I I"l"ÿ
}(7. tÿ
U
0f °04ÿZ
---'v a
s -.-i
"
.
How many milliliters of 18.o M sulfuric acid, H=SO4(aq)' must be diluted with water to prepare
5.00 x lO3 mLof o.250 M sulfuric acid?
" 7 "° i
}%
"
ÿ "g
''
{:
71,
'..........
"
...... )<
+
'
"";'
(it
/l
ÿ.
./tO
Oÿ
tf
#5 Answer:
-¢\
"'"
)
Molarity and Dilutions; Solve the following molarity and di!ution problems. Round all answers to the
correct number of significant figures. Make sure all answers have the correct unit.
,
What is the molarity of a solution in which lO.8 grams of calcium chloride is dissolved in enough
water to make 125 mL of solution?
,-
#6 Answer:
y..
10, -:;:.;;t'- :
,(:fcti:;t ,oq -.;
t
J ,>'
.!. ,//Y
,+ , '<]
,
If 37.6 grams of sodium bromide, NaBr, are added to enough water to make a solution whose
molarity is 0.4o0 M, how many liters of solution do you have?
•
]
#7 Answer:
:i ",:,1 = , .}
'-V,
:
"-
.
. ",llJ"
,
'. -
How many milliliters of a stock solution of 4.oo M KI would you need to prepare 255 mL of o.76o M
KI?
Ivÿ,,)L;: Iv%Vÿ
I-
d '>
.
'
#8 Answer:
'i q ''
How many moles of solute are present in 1.5o Lof 0.240 M Na2SO4?
s
#9 Answer:
O
lO. Suppose you need :255 mL of 0.200 M NaCI, but the only supply of sodium chloride you have is a
solution of 1.oo M NaCI. How many milliliters of solution do you need to prepare 255 mL of
o.2oo M NaCI?
#1o Answer;
[,'I s
'ÿ";
iÿ 0 0 (%
How would you prepare this solution?
mLof 0.200 M NaCI
Final solution:
Initial solution:
:? I , ()
mLof1.00 M NaCI
In this dilution, what is the amount of distilled water that you need to add to the initial solution?
,
.....
........
,,.,.
i
...','),..
"','
..,.; I
mLdistilled HÿO