calculate the equilibrium pressure of CO2 in a closed 1 L vessel that contains each of the following samples. Assume that ΔH∘ and ΔS∘ are independent of temperature:
15 g of MgCO3 and 1.0 g of MgO at 25 ∘C
15 g of MgCO3 and 1.0 g of MgO at -40 ∘C
30 g of MgCO3 and 1.0 g of MgO at -40 ∘C
In: Chemistry
Composition of Solution for Determing k
| Test Tube | 0.0025 M Fe(NO3)3 | 0.0025 M KSCN | 0.10 M HNO3 | Results of Spectro | Absorbance |
| 6 | 1.0 ml | 1.0 ml | 5.0 ml | ---> | .109 |
| 7 | 1.0 ml | 1.5 ml | 4.5 ml | .183 | |
| 8 | 1.0 ml | 2.0 ml | 4.0 ml | .278 | |
| 9 | 1.0 ml | 2.5 ml | 3.5 ml | .295 | |
| 10 | 1.0 ml | 3.0 ml | 3.0 ml | .337 |
| Test Tube | Starting Fe3+ | Starting SCN- | Equlibrium Fe(SCN)2+ | Eq. Fe3+ | Eq. SCN- |
| 6 | |||||
| 7 | |||||
| 8 | |||||
| 9 | |||||
| 10 |
Complete the above chart with all concentrations in M. * Coulmns 1 and 2 dilution occured for both Fe(NO3)3 "Fe3+" and KSCN "SCN-", Column 3 determine FeSCN2+ using A=kc, Columns 4 and 5 create and ICE chart for each test tube, Column 6 determine the value of K for each test tube of Equilibrium for Fe(SCN)2+, Fe3+, SCN-
In: Chemistry
Observing chemical reactions. Bolded reactions indicate the solution made in previous step
For the reactions listed below, provide the following:
-product formed from the reaction
-evidence that a chemical change occurred
-eg. Color change, temperature increase or decrease, evolution of gas, sight of a precipitate, or appearance of odor.
CoCl2 + 95% ethyl alcohol
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H2O + [CoCl2(6H2O)+95%ethyl alcohol]
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0.5M NaHCO3 + [H2O + CoCl2(6H2O)+95%ethyl alcohol]
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Mg + 1M HCl
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Steel Wool + CaSO4
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0.5M NaHCO + 0.1M CuSO4
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1M NH3 + [0.5M NaHCO + 0.1M CuSO4]
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NaHCO3 + 1M HCl
____________________________________________________________________________________________________________________________________________________________
NH4SCN + BaOH2(8 H2O)
____________________________________________________________________________________________________________________________________________________________
In: Chemistry
3. Calculate the pH of a buffer solution made by adding 25.5 g of NaCH3CO2 (MW:82.034g/mol), and 0.550M HCH3CO2 (Ka=1.8x10-5) to make 500 mL of the buffer. a. Identify the acid and the base (write the formula and the ID next to it) b. Will Na+ affect the pH of the solution? Why? c. What is your prediction for the calculated pH compared to the pKa of the sample? Why? d. What is the pH of the solution? Was your prediction correct?
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How does ring size, hybridization and degree of carbon (1st degree, 2nd degree, 3rd degree) affect SN1 and SN2 reactions?
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5. What is the pH of 250.0mL solution that is 0.0955 M HCH3CO2 (Ka=1.8x10-5) and 0.125 M NaCH3CO2. a. Now, 20.0 mL of 0.455 M HCl (aq) is added to the original buffer. i. Write the neutralization reaction (use the actual species in the reaction). ii. Find the moles of all species. iii. Build a stoichiometry table with the reaction and the data (or anything that shows what happens in the reaction). iv. What is your prediction for the pH change compared with the original buffer? Compared to the pKa? v. What is the pH of the solution? Was your prediction correct? vi. Do you still have a buffer? Why? b. What is the pH of the system if instead, 20.0mL of 0.455M Ca(OH)2(aq) is added to the original buffer? i. Do you still have a buffer? Why?
In: Chemistry
1.A solution is made by mixing 0.150 M NH4Cl and 0.100 M NH3. Ka for NH4+ is 5.61x10-10
a.What type of solution you will have when the two compounds are mixed?
b.Identify the acid and the base (write the formula and the ID next to it)
c.Will Cl- affect the pH of the solution? Why?
d.What is your prediction for the calculated pH compared to the pKa of the sample? Why?
e.What is the pH of the solution? Was your prediction correct?
In: Chemistry
Net-Ionic Equation for Hydrolysis? Expression for equilibrium constant (Ka or Kb)? Value of Ka or Kb? for NaC2H3O3, Na2CO3, NH4Cl, ZnCl2, KAl(SO4)2
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A 1.045 L sample of HCl gas at 25∘C and 732.0 mm Hg was absorbed completely in an aqueous solution that contained 7.086 g of Na2CO3 and 270.0 g of water. What is the pH of the solution?
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What role does water play in the reaction with t-BuCl? Choose all that apply. Multiple answers: You can select more than one opt
ion A nucleophile B solvent C acid D base
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Which of the following reactive species does not play a role in the initiation of lipid peroxidation?
a) Nitric oxide
b) All of the above plays a role in the initiation of lipid peroxidation
c) Superoxide radical
d) Triplet oxygen
e) Iron ion
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Calculate the volume of 0.820-M NaOH solution needed to completely neutralize 112 mL of a 0.620-M solution of the monoprotic acid HCl.
__________ mL NaOH
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I have two liquids: Petroleum ether and water. I want to dissolve salt (NaCl), benzene (C6H6), alcohol (CH3OH), octane (C8H18), and butter (C55H98O6) into one of the two solvents. Using “like dissolves like”, choose which of the two solvents each of the substances will dissolve into.
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A 1.095 L sample of HCl gas at 25 C and 732.0 mmHg was absorbed completely in an aqueous solution that contained 7.152 g of Na2CO3 and 268.5 g of water.
1) What is the pH of the solution?
2) What is the freezing point of the solution?
3) What is the vapor pressure of the solution? (The vapor pressure of pure water at 25 C is 23.76 mmHg.)
If you can show work that would be great.
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For a particular redox reaction NO2– is oxidized to NO3– and Cu2 is reduced to Cu . Complete and balance the equation for this reaction in basic solution. Phases are optional. NO2- + Cu2+ ----> NO3- + Cu+
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