A .053M solution of a weak base has a pH of 9.87. What is the Kb of this weak monprotic acid?
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The formation constant* of [M(CN)6]4– is 2.50 × 1017, where M is a generic metal. A 0.130-mole quantity of M(NO3)2 is added to a liter of 1.150 M NaCN solution. What is the concentration of M2 ions at equilibrium?
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1. Add 0.5 mL of 0.10 M NiCl2 solution to each of 7 test tubes using dropper provided. Label these tubes 1 through 7. 2. Add the following to the respective tubes containing the NiCl2 solution,
Tube 1: 5 drops of water (used here as a control experiment for dilution)
Tube 2: 1 mL of conc. HCl
Tube 3: 5 drops of conc. ammonia
Tube 4: 5 drops of dilute (5% v/v) ethylenediamine solution
Tube 5: 5 drops of 0.25 M C2O4 2- (oxalate) solution
Tube 6: 5 drops of 0.1 M SCN- (thiocyanate) solution
Tube 7: 5 drops of 0.1 M EDTA solution Mix each solution thoroughly and be sure to note the colour of each tube.
3. Check the stability of each complex by adding 3-5 drops of 1 M NaOH solution. Note any changes (e.g., formation of precipitate, colour change, etc.)
4. Add 0.5 mL of 0.10 M CuSO4 solution to each of 7 new test tubes labeled 8 through 14 using dropper provided. Repeat steps 2 and 3.
The “field strength” of a ligand describes how strong the coordination bond is, for a given metal and the ligand that is considered. The field strength is evaluated by considering how much it causes the d orbitals to split (DE), which of the ligands is strongest? Which is the weakest? Explain your choices in each case.
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The balanced equation for the neutralization reaction of aqueous H2SO4 with aqueous KOH is shown.
H2SO4(aq)====>2H2O (l) +K2SO4(aq)
What volume of 0.370 M KOH is needed to react completely with 15.5 mL of 0.135 M H2SO4? Assume the reaction goes to completion.
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Calculate the pH when 2.63 g of C6H5COONa is added to 41 mL of 0.50 M benzoic acid, C6H5COOH. Ignore any changes in volume. The Ka value for C6H5COOH is 6.5 x 10-5
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This question related to Diels-Alder Reaction of Anthracene and Maleic Anyhydride.
1. Show the product of the reaction of water with the anhydride product
2. The procedure warns against adding a lot of xylene during recystalization. Why?
3. What is the differences in the carbonyl region of the IR between the starting material and the product.
4. What specific band in the IR is unique to the product and confirms that you have made the product and do not have a mixture of the starting material? Explain.
5. Predict the product of the self-dimerization(via Diels-Alder reaction) of cyclopentadiene.;
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Calculate the molar solubility of Ca(IO3)2 in
a) 0.060 M Ca(NO3)2
b) 0.060 M NaIO3
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If you eat a 48 g serving rice every fourth day and you weigh 75 kg, what is your dose of inorganic arsenic (in µg per kg body weight per day) if the rice contains 386 µg kg-1 of total arsenic, 45% of which is inorganic arsenic.
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The following picture represents a sample of gas at a pressure of 1 atm, a volume of 1 L, and a temperature of 25 ?C
What would happen to the pressure if the volume were reduced to 0.4L and the temperature increased to 260?C?
In: Chemistry
a cube of osmium metal 1.500 cm on one of its sides. It also has
the mass of 76.31g at 25°C please help me solve this problem by
showing your work so I can compare my answers.
a. what is the density g/cm3 at this temp
b. the density of titanium metal 4.51g/cm3 at 25°C. what
mass of titanium 'displaces' 68.8mL of water at 25°C
c. the density of benzene at 15°C is 0.8787 g/mL. determine the
mass of 0.1900L of benzene at this temp.
Thank you so much!
In: Chemistry
1a- Discuss the vaporization of water in standard condition at 298 K in term of: -A exothermicity and endothermicity -Achange of entropy of the system and the surrounding - A spontaneity of the reaction. 1b- Explain how the temperature and the composition of the two phases (liquid and vapour) influence the spontaneity of the vaporization of water. Please show steps and give ample explanation. Thank you
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Please solve
What is the percent dissociation of HNO2 when 0.074 g of sodium nitrite is added to 115.0 mL of a 0.068 M HNO2 solution? Ka for HNO2 is 4.0 × 10–4. (4%)
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How many moles of NH4Cl must be added to 100 mL of 0.1 M NH4OH solution to prevent precipitation of Mn(OH)2 when this solution is added to 100 mL of a 0.002 M solution of MnCl2? Assume no change involume on addition of NH4Cl.
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Write the Total and Net Ionic Equation for the following; make sure to include state symbols
Calcium plus a solution of hydrochloric acid
Chlorine plus a solution of potassium bromide
A solution of ammonium chloride plus sodium hydroxide
A solution of lead(II) nitrate plus a solution of sodium sulfate
A solution of bromic acid plus a solution of sodium nitrate
A solution of calcium nitrate plus a solution of potassium chloride
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The concept of energy charge is a very useful way to think about how ATP levels control pathway activity. Discuss the role of ATP in the glycolytic pathway (between glucose and pyruvate and/or lactate) with a focus on how energy charge would alter the pathway and how the pathway activity would alter energy charge. Include both general aspects and specific ATP use and generation.
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