a) Calculate the solubility (in grams per 1.00×10^2mL of solution) of magnesium hydroxide in a solution buffered at pH = 12.
S1 = _________________ g/(1.00×10^2mL)
b) Calculate the solubility (in grams per 1.00×10^2mL of solution) of magnesium hydroxide in pure water.
S = __________________ g/(1.00×10^2mL)
c) How does the solubility of Mg(OH)2 in a buffered solution compare to the solubility of Mg(OH)2 in pure water?
S1/S = ________________
TIA.
In: Chemistry
In: Chemistry
A voltaic cell is constructed that is based on the following
reaction:
Sn2+(aq)+Pb(s)→Sn(s)+Pb2+(aq).
Part A If the concentration of
Sn2+ in the cathode compartment is 1.50 M and the cell generates an emf of 0.18 V , what is the concentration of Pb2+ in the anode compartment?
Part B If the anode compartment contains
[SO2−4]= 1.40 M in equilibrium with PbSO4(s), what is the Ksp of PbSO4?
In: Chemistry
Complete and Balance:
a. Fe3+ + NH3OH+ = Fe2+ + N2
b. Fe3+ + NH3OH+ = Fe2+ + N2O
c. Fe3+ + NH3OH+ = Fe2+ + NO
d. Fe3+ + NH3OH+ = Fe2+ + NO2
e. Fe3+ + NH3OH+ = Fe2+ + NO3-
In: Chemistry
Complete the following table of data for Ce2(SO4)3 · 9 H2O. (Assume the density of water is 1.00 g/mL.)
| T (°C) |
Solubility (g/100. g) |
Concentration (M) |
Ksp |
?G (kJ/mol) |
|---|---|---|---|---|
| 27.0 | 9.27 | ____ | ____ | ____ |
| 34.0 | 7.82 | ____ | ____ | ____ |
| 41.0 | 6.54 | ____ | ____ | ____ |
| 48.0 | 5.45 | ____ | ____ | ____ |
| 55.0 | 4.54 | ____ | ____ | ____ |
| 62.0 | 3.81 | ____ | ____ | ____ |
| 69.0 | 3.26 | ____ | ____ | ____ |
Use a graph of ?G vs. T to determine the following. (Enter your answers to three significant figures.)
What is the value of ?H for the system?
_________kJ/mol
What is the value of ?S for the system?
__________J/mol·K
In: Chemistry
According to the hard and soft acid and bases indicate with arrow the direction of the favored reaction ,balance the equation and indicate which is a harder or softer acid and harder or softer base.
a)CuCl + LiCH2CH3 ______________ CuCH2CH3 + LiCl
b)KN3 + FeCO3----------K2CO3 + Fe(N3)2
c)Sr(ClO4 )2 + AgI ----------AgClO4 + SrI2
d)NaCN + FeCl2 ----------NaCl + Na4Fe(CN)6
e) KOCH3 + PdS2O3-------- K2S2O3 + Pt(OCH3)2
In: Chemistry
EDTA is a hexaprotic system with the following pKa values: pKa1 = 0.00 pKa4 = 2.69 pKa2 = 1.50 pKa5 = 6.13 pKa3 = 2.00 pKa6 = 10.37 The distribution of protonated forms of EDTA will therefore vary with pH. For equilibrium calculations involving metal complexes with EDTA, it is convenient to calculate the fraction of EDTA that is in the completely unprotonated form, Y4– . This fraction is designated αY4–. Calculate αY4– at the following two pH values:
pH=3.45
pH=10.85
In: Chemistry
How much energy (in kilojoules) is released when 30.5g of ethanol vapor at 97.5?C is cooled to -16.5?C? Ethanol has mp = -114.5 ?C, bp = 78.4 ?C, ?Hvap = 38.56 kJ/mol and ?Hfusion = 4.60 kJ/mol. The molar heat capacity is 113 J/(K?mol) for the liquid and 65.7 J/(K?mol) for the vapor.
In: Chemistry
250 gallons of water (at 25 degrees Celsius and 1 atmospheric pressure) are boiled to power a steam engine. The heat source to boil the water is the combustion of methanol according the the reaction below. 2 CH3OH (liters) + 3 O2 (grams) −→ 2 CO2 (grams) + 4 H2O (liters) Using the enthalpy of the combustion of methanol (at 25 degrees Celsius and 1 atmospheric pressure), how many liters of methanol are required to boil the 250 gallons of water?
In: Chemistry
6. What is an addition reaction?
a. What type of starting materials are used for addition reactions?
(functional group)
b. What type of reagents are used for addition reactions?
In: Chemistry
1) Glucose has molecular formula C6H12O6.
a) Draw the three distinct forms of glucose that exist in equilibrium in solution.
b) What is the term used to describe the inter-conversion of the three forms of glucose?
This is one question asked on my tutorial with no pictures etc. I'm at an absolute loss if you can help. Thank you!
In: Chemistry
Ionization energy is the energy needed to eject an electron from an atom or ion. Calculate the ionization energy, IE, of the one-electron ion Be3 . The electron starts in the lowest energy level, n=1.
In: Chemistry
Refer to this table of reduction potentials to answer the questions. Reduction half-reaction Potential (V) F2(g)+2e−→2F−(aq) +2.87 O2(g)+4H+(aq)+4e−→2H2O(l) +1.23 Br2(l)+2e−→2Br−(aq) +1.07 Ag++e−→Ag(s) +0.80 2H2O(l)+2e−→H2(g)+2OH−(aq) −0.83 Na+(aq)+e−→Na(s) −2.71 What is produced at each electrode in the electrolysis of an aqueous solution of both NaBr and AgF? Drag the appropriate items to their respective bins. Na(s) H2(g) F2(g) O2(g) Ag(s) Br2(l)
In: Chemistry
A 25.0mL of 0.152M H2SO4 was reacted with 20.0mL of
0.410 M NaOH.
Calculate the concentration of the salt that is formed during the
reaction as well as the concentrations of H2SO4 and NaOH that
remain in solution.
In: Chemistry