1. Which of the following balanced molecular equations represent reactions for w
ID: 959759 • Letter: 1
Question
1. Which of the following balanced molecular equations represent reactions for which the rate law expression could likely be determined via time to turbidity determinations? Select all that apply.
a. 3 SrCl2 (aq) + 2 Li3PO4 (aq) ---> Sr3(PO4)2 (s) + 6 LiCl (aq)
b. 2 HBr (aq) + Ca(OH)2 (aq) ---> 2 H2O (l) + CaBr2 (aq)
c. FeS (s) + HCl (aq) ---> FeCl2 (aq) + H2S (g)
d. 2 NO (g) + 5 H2 (g) ---> 2 NH3 (g) + 2 H2O (g)
e. 2 KI (aq) + Pb(NO3)2 (aq) ---> PbI2 (s) + 2 KNO3 (aq)
2.
The above table summarizes the amounts and concentrations of the reactants that will be used in each trial in Parts II. Use the dilution equation, M1V1= M2V2, to calculate the concentration Mf (molarityfinal) of Na2S2O3 in each well after mixing but before any reaction occurs. The [HCl] has been worked for you as an example.
M1(HCl)V1 = M2(HCl)V2 where V2 = final total volume Vf
(1.0 M)(2.0 mL) = M2(HCl)(5.0 mL)
M2(HCl) = 0.40 M = Mf(HCl)
well 1 Mf
well 2 Mf
well 3 M
0.30 M
0.18 M
0.60 M
0.090 M
0.20 M
0.060
volume of 1.0 M HCl volume of water volume of 0.3 M Na2S2O3 well 1 2.0 mL 0 3.0 mL well 2 2.0 mL 1.5 mL 1.5 mL well 3 2.0 mL 2.0 mL 1.0 mLExplanation / Answer
1. Of the following balanced molecular equations, the ones which represent reactions for which the rate law expression could likely be determined via time to turbidity determinations are,
a. 3 SrCl2 (aq) + 2 Li3PO4 (aq) ---> Sr3(PO4)2 (s) + 6 LiCl (aq)
e. 2 KI (aq) + Pb(NO3)2 (aq) ---> PbI2 (s) + 2 KNO3 (aq)
2. Using Mf (final molarity of Na2S2O3) = initial molarity x initial volume/total volume
we get,
well 1 Mf = 0.3 x 3/5 = 0.18 M [b. 0.18]
well 2 Mf = 0.3 x 1.5/5 = 0.09 M [d. 0.18]
well 3 Mf = 0.3 x 1.0/5 = 0.06 M [f. 0.18]
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