Show with calculations whether a precipitate will form if: (a) 30.0 ml of 0.0024 M AgNO3 is mixed with 70.0 ml of 0.0036 M NaCl. (b) a solution that is 0.30 M with respect to HCl and 0.01 M with respect to Fe2+ is saturated with H2S (i.e. 0.10 M H2S). For FeS, Ksp = 3.7x10-19. Ksp for AgCl = 1.7x10-10.
In: Chemistry
1) Draw the skeletal structures of the 3 products formed from
CH4 and Cl in free radical reactions.
1a) Draw the skeletal structure of the major monohalogenated
organic product when cyclohexane reacts with Br in the presence of
light and heat.
1b)Draw the skeletal structure of the major monohalogenated organic
product when 2,2,4-trimethylhexane is treated with Br in the
presence of light and heat.
In: Chemistry
1. A solution contains 1.43×10-2 M
sodium phosphate and
6.22×10-3 M potassium
hydroxide.
Solid aluminum nitrate is added slowly to this
mixture.
What is the concentration of hydroxide ion when
phosphate ion begins to precipitate?
[hydroxide] = M
2.A solution contains 9.99×10-3 M
calcium nitrate and
1.06×10-2 M barium
acetate.
Solid sodium fluoride is added slowly to this
mixture.
What is the concentration of calcium ion when
barium ion begins to precipitate?
[Ca2+] = M
3.A solution contains 1.19×10-2 M
potassium phosphate and
1.12×10-2 M ammonium
sulfide.
Solid zinc acetate is added slowly to this
mixture.
What is the concentration of sulfide ion when
phosphate ion begins to precipitate?
[sulfide] = M
KSPS=PbBr26.3 × 10-6
AgBr3.3 × 10-13CarbonatesBaCO38.1 ×
10-9
CaCO33.8 × 10-9
CoCO38.0 × 10-13
CuCO32.5 × 10-10
FeCO33.5 × 10-11
PbCO31.5 × 10-13
MgCO34.0 × 10-5
MnCO31.8 × 10-11
NiCO36.6 × 10-9
Ag2CO38.1 × 10-12
ZnCO31.5 × 10-11ChloridesPbCl21.7
× 10-5
AgCl1.8 × 10-10ChromatesBaCrO42.0 ×
10-10
CaCrO47.1 × 10-4
PbCrO41.8 × 10-14
Ag2CrO49.0 ×
10-12CyanidesNi(CN)23.0 ×
10-23
AgCN1.2 × 10-16
Zn(CN)28.0 × 10-12FluoridesBaF21.7
× 10-6
CaF23.9 × 10-11
PbF23.7 × 10-8
MgF26.4 × 10-9HydroxidesAgOH2.0 ×
10-8
Al(OH)31.9 × 10-33
Ca(OH)27.9 × 10-6
Cr(OH)36.7 × 10-31
Co(OH)22.5 × 10-16
Cu(OH)21.6 × 10-19
Fe(OH)27.9 × 10-15
Fe(OH)36.3 × 10-38
Pb(OH)22.8 × 10-16
Mg(OH)21.5 × 10-11
Mn(OH)24.6 × 10-14
Ni(OH)22.8 × 10-16
Zn(OH)24.5 × 10-17IodidesPbI28.7 ×
10-9
AgI1.5 × 10-16OxalatesBaC2O41.1 ×
10-7
CaC2O42.3 × 10-9
MgC2O48.6 ×
10-5PhosphatesAlPO41.3 ×
10-20
Ba3(PO4)21.3 ×
10-29
Ca3(PO4)21.0 ×
10-25
CrPO42.4 × 10-23
Pb3(PO4)23.0 ×
10-44
Ag3PO41.3 × 10-20
Zn3(PO4)29.1 ×
10-33SulfatesBaSO41.1 ×
10-10
CaSO42.4 × 10-5
PbSO41.8 × 10-8
Ag2SO41.7 × 10-5SulfidesCaS8 ×
10-6
CoS5.9 × 10-21
CuS7.9 × 10-37
FeS4.9 × 10-18
Fe2S31.4 × 10-88
PbS3.2 × 10-28
MnS5.1 × 10-15
NiS3.0 × 10-21
Ag2S1.0 × 10-49
ZnS2.0 × 10-25SulfitesBaSO38.0 ×
10-7
CaSO31.3 × 10-8
Ag2SO31.5 × 10-14
In: Chemistry
2. Describe how you would prepare 100ml of 0.08 M sulfuric acid [H2SO4] from an 18 M concentrated sulfuric acid stock solution.
3. Describe how you would prepare 50 ml of 0.2 M potassium iodate [KIO3] dissolved in the 0.08 M sulfuric acid [H2SO4] that you have prepared above.
4. Describe how you would prepare 25 ml of 3.6 M hydrogen peroxide [h2O2] from a 30% (w/w) stock H2O2 solution (
5. Describe how you would prepare 50 ml of a 3% (w/v) soluble starch solution in water.
Molecular weights:
Malonic acid: 104.6
Manganese sulfate: 169.01
Potassium iodate: 214
Hydrogen peroxide: 34.01
In: Chemistry
A. Starting with 500 g of N2 and 500 g of H2 how much
NH3 can you form? And how much of the excess reagent ( N2 or H2)
remains (eg. is left over) after the reaction goes to
completion?
B. Starting with 50 g of sulfuric acid and 40 g of baking soda, how
much sodium sulfate is produced?
C. Based on the information in 6d above, how much of
the excess reactant remains after the reaction has gone to
completion?
In: Chemistry
A student seeks to neutralize 225mL of a 0.0369M sodium bicarbonate solution by addition of 0.222M sulfuric acid solution according to the following reaction: H2SO4(aq)+ NaHCO3(aq)---> Na2SO4(aq)+ H2O(l)+ CO2(g).
A.) Classify the reaction
B.) To neutralize the sodium bicarbonate, how many mL of sulfuric acid solution does the student need to add?
C.) How many grams of carbon dioxide gas is formed during the neutralization?
D.) What is the molarity of the sodium sulfate produced following the neutralization?
In: Chemistry
ZnCl2 (aq) + Al (s) ---- Zn(s) + AlCl3 (aq)
[Al3+] = 0.8 M [Zn2+] = 1.3M
Zn2+(aq) +2e- ---Zn(s) -0.76V
Al3+(aq) + 3e- --- Al (s) -1.66V
Balance the equation above.
Give the equation for the reaction quotient(Q) and solve for it. Are there units for (Q)?
Solve for the standard potential for the cell (EO cell) at 295K. First give equation.
Solve the Nernst equation for this cell at 295K.
In: Chemistry
A student researcher performed a chromatographic separation of caffeine and aspartame with methanol as the mobile phase using a C–18 column. The retention times for methanol (tm) , caffeine (tc) , and aspartame (ta) were 41.8 s , 96.3 s , and 143.8 s , respectively.
What is the selectivity factor (relative retention), α , for this column?
α=
Calculate the hypothetical retention times for caffeine and aspartame if their retention factors were reduced by 28.0% . Assume the mobile phase retention time (tm=41.8 s) remains constant.
tcaffeine=
staspartame=
Select the statements that correctly describe the outcome if the partition coefficient for caffeine (Kc) were to decrease.
The retention time of caffeine would increase.
The retention time of caffeine would decrease.
Caffeine would spend a greater amount of time in the mobile phase.
The retention factor of caffeine would decrease.
The retention factor of caffeine would increase.
The retention time and retention factor of caffeine would not change.
In: Chemistry
if 17.058g of sodium chloride can be formed from 25 g NaNO3, is the limiting reagent CuCI2 or NaNO3?
In: Chemistry
Graphene has a C-C bond length of 1.42 Å.
(a) Suppose you deposit a single layer of graphene around the entire earth, which has a diameter of 1.27 × 10^7 m. What would be the mass of this graphene layer?
(b) If the graphite in a wooden pencil has a mass of 60 g, what surface area could it cover, if it would be exfoliated as a single layer of graphene?
In: Chemistry
97.8 grams of sodium fluoride is put into 350. ml of water.
Calculate the
Molarity
Molality
Mass Percent
Mole Fraction
In: Chemistry
In: Chemistry
In: Chemistry
What is the appropriate equation for determining the standard deviation of an analytical result from a calibration curve? Define all symbols used.
In: Chemistry
1) Suppose 500 mL of an 0.200 molar HCl acid is titrated with 70.0 mL of a 1.00 M NaOH solution. What is the final pH of the solution? The error interval is 0.1 pH units.
2) Suppose 500 mL of 0.100 M benzoic acid, which has a pKa of 4.201, solution is titrated with 75.0 mL of a 1.00 M NaOH. What is the final pH? The error interval is +/- 0.2 pH units.
In: Chemistry