CHEM 139: AcidsoBases,& StoichiometryPractice Problems
1. Phosphoricacidreactswith strontiumhydroxideto producea precipitate.
a. Write the balancedchemicalequationfor thereaction'
qu,"L?,!^!}f'
+ ?irftn
birrlrt)r
lrftt?o,{W
W
with
,*"",,Jfr?fJlJrlct
produced
when25.0mLof0.750M
is
ofprecipitate
b. whatmass
acid?
45.0mL of 0.500MPhosPhoric
'U
lrJrJ?
'lr{,0
91fr'Yt'U*0"
"1r*lwry
*VFilW
L,
O,vtlo
lr:'mw(w
vt& Il(
0,0180v,
t,'P
*,fta)"
l*[- iw w,ffi0fr{fffurwD'
rM
lr,VVfu,ftuil,
c. Whatvolumeof a 1.50Mstrontiumhydroxidesolutionis
50.0mL of a 0.675Mphosphoricacidsolution?
oWuor,
lrlilrn(,
l,lr,r,ilqvMDy
2. Nitric acid can be prepared as follows: 3 NO2(g/ + HzO(l) -+ 2 HNO3(uq) + NO(S)
a. Calculatethe massof NOz gasrequiredto produce250.0mL of 1.50M nitric acid.
r 1',^fi]
M - ilg,
A,'Nflr[rrl'1CIdilrfr,
ilL,
:\ Nqq
:J /
:NOz(d
2. Nitricacidcanbepreparedasfollows:
+ HzOA) + 2I{NO{u'q) + NO(g/
b. Calcrrlatethe molarity of a nitric acidsolutionpreparedby bubbling10.0g of nitrogendioxide
gasin 500.0mL of deionizedwater.(Assumethetotal volumeof theresultingsolutionis aiso
^n.^,
,W
- v-' .qt 0f , l' *, *sXy'b, t'ror ,r y l a L v f i o - { t /
|Ml"t
qtnn')
=g
- toj(?.8tozr
[o
t,H'
3. A stude4tpreparesa calciumhydroxidesolutionby mixing calciumoxidewiithwater,
CaO($ + n2O@ + Ca(oH)z@q)
a. Calcplatethe molarity of a calcium hydroxide solution preparedby comprletelyreacting 1.50 g of
calci[rm oxide with 2.5 L of deionizedwater.
q(^0'4C^g,l-d,crtry)
l.ttt
o'An,h{',r',1
aW),
r/
lmo'=
bb.o&qcno
lJ
A ^ ^rr\
= 'oniltltt,v"'l'ury)'
- 0.oil0(,{100
M
[utol)r]
'l/'9V
the pH of the solutiondescribedin part a.
b. CalcJulate
='0.0ltM
' 0.0-!lt
lq0M
- fol{l,xfuotgO,qm
Itnfoft)zl
'1.(rJ It,,lh
-' =-{3Ftll
flot{