. Advertisement .
..3..
. Advertisement .
..4..
15. The mixing of which pair of reactants will result in a precipitation reaction?
CsI(aq) + NaOH(aq)
HCl(aq) + Ca(OH)2(aq)
K2SO4(aq) + Hg2(NO3)2(aq)
NaNO3(aq) + NH4Cl(aq)
16. Which of the following is a precipitation reaction?
Zn(s) + 2 AgNO3(aq) 2 Ag(s) + Zn(NO3)2(aq)
NaCl(aq) + LiI(aq) NaI(aq) + LiCl(aq)
2 KI(aq) + Hg2(NO3)2(aq) Hg2I2(s) + 2 KNO3(aq)
HI(aq) + NaOH(aq) NaI(aq) + H2O(l)
None of these are precipitation reactions.
17. Which of the following pairs of aqueous solutions will form a precipitate when mixed?
K2CO3 + NaBr
Na2 SO4 + KOH
CaS + Na2SO4
None of these solution pairs will produce a precipitate.
All of these solution pairs will produce a precipitate.
18. Which of the following pairs of aqueous solutions will form a precipitate when mixed?
NH4NO3 + Li2CO3
Hg2(NO3)2 + LiCl
NaCl + Li3PO4
AgC2H3O2 + Cu(NO3)2
None of these solution pairs will produce a precipitate.
19. Silver ions can be precipitated from aqueous solutions by the addition of aqueous chloride:
Silver chloride is virtually insoluble in water so that the reaction appears to go to completion. How many grams of solid NaCl must be added to 25.0 mL of 0.366 M AgNO3 solution to completely precipitate the silver?
9.15 × 10-3 g
1.57 × 10-4 g
0.535 g
0.157 g
6.39 × 103 g
20. Identify the polyprotic acid.
H2SO4
HCl
LiCl
LiOH
Ca(OH)2
21.In an acid-base neutralization reaction 38.74 mL of 0.500 M potassium hydroxide reacts with 50.00 mL of sulfuric acid solution. What is the concentration of the H2SO4 solution?
0.194 M
0.387 M
0.775 M
1.29 M
22. A solution is prepared by mixing 50.0 mL of 0.100 M HCl and 10.0 mL of 0.200 M NaCl. What is the molarity of chloride ion in this solution?
0.183
8.57
3.50
0.0500
0.117
23. A solution is prepared by adding 1.60 g of solid NaCl to 50.0 mL of 0.100 M CaCl2. What is the molarity of chloride ion in the final solution? Assume that the volume of the final solution is 50.0 mL.
0.747
0.647
0.132
0.232
0.547
24. What is the molarity of a NaOH solution if 28.2 mL of a 0.355 M H2SO4 solution is required to neutralize a 25.0-mL sample of the NaOH solution?
0.801
0.315
0.629
125
0.400
25. What is the oxidation number of the sulfur atom in K2SO4 ?
-2
+2
+4
+6
26.Determine the oxidation state of S in Na2SO4.
-4
+2
+4
+6
-2
27. Identify the oxidation state of Ba in Ba(s).
+1
+2
0
-1
-2
28. Balance the chemical equation given below, and determine the number of grams of MgO are needed to produce 10.0 g of Fe2O3.
0.312 g
0.841 g
2.52 g
7.57 g
29. If the density of ethanol, C2H5OH, is 0.789 g/mL. How many milliliters of ethanol are needed to produce 15.0 g of CO2 according to the following chemical equation?
6.19 mL
9.95 mL
19.9 mL
39.8 mL
30. If the percent yield for the following reaction is 75.0%, and 45.0 g of NO2 are consumed in the reaction, how many grams of nitric acid, HNO3(aq) are produced?
30.8 g
41.1 g
54.8 g
69.3 g
31. Determine the theoretical yield of H2S (in moles) if 64 mol Al2S3 and 64 mol H2O are reacted according to the following balanced reaction. A possibly useful molar mass is Al2S3 = 150.17 g/mol.
192 mol H2S
64 mol H2S
128 mol H2S
96 mol H2S
32 mol H2S
32. Which substance is the limiting reactant when 2.0 g of sulfur reacts with 3.0 g of oxygen and 4.0 g of sodium hydroxide according to the following chemical equation
S(s)
O2(g)
NaOH(aq)
None of these substances is the limiting reactant.
Precipitation is a chemical process where two soluble compounds react to each one to create an insoluble precipitate. The substances whose lattice energy is greater than their hydration enthalpy which are not soluble in water, and thus form an undissolved precipitate.
1 Answer