A. A 75.0-mLmL volume of 0.200 MM NH3NH3 (Kb=1.8×10−5Kb=1.8×10−5) is titrated with 0.500 MM HNO3HNO3. Calculate the pHpH after the addition of 11.0 mLmL of HNO3HNO3.
B. A 50.0-mLmL volume of 0.15 MM HBrHBr is titrated with 0.25 MM KOHKOH. Calculate the pHpH after the addition of 15.0 mLmL of KOHKOH.
C. A 52.0-mLmL volume of 0.35 MM CH3COOHCH3COOH (Ka=1.8×10−5Ka=1.8×10−5) is titrated with 0.40 MM NaOHNaOH. Calculate the pHpH after the addition of 17.0 mLmL of NaOHNaOH.
In: Chemistry
What mass of oxygen will react with 16.6 g of aluminum according to the following reaction?
4 Al + 3 O2 ? 2 Al2O3
In: Chemistry
Post Lab Questions:
1. Describe the underlying principle of VSEPR theory.
2. Explain why two compounds with the same generic formula, NH3 and BH3, have different geometries and different shapes.
3. Why are the structures of H2S and H2O so similar? Why are the structures of O3and SO2 so different?
4. Although PH3 and BH3 both contain bonds with similar polarity, one molecule is polar while the other molecule is nonpolar. Explain.
5. Write a detailed procedure for converting a chemical formula into a Lewis structure and how to determine the shape, and polarity from this Lewis structure.
Plz you can number the answes that will be very helpful. Thanks
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Suppose 39.4g of zinc chloride is dissolved in 250.mL of a 0.60 M aqueous solution of potassium carbonate. Calculate the final molarity of zinc cation in the solution. You can assume the volume of the solution doesn't change when the zinc chloride is dissolved in it. Round your answer to 2 significant digits.
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How many rotational degrees of freedom are there in a carbon dioxide (CO2) molecule? Under low pressure, CO2 gas heated up to high enough temperature to excite its translational, rotational and vibrational modes, (i) find its specific heats and (ii) compare the specific heats from (i) and literature values at moderate temperatures.
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a)Provide two examples of corrosion that are destructive.
For each, provide the chemical equation that describes the corrosion, and an example of an object that could be impacted by it. For example rust on vehicles compromising the frame.
b)Which reactions would you combine in a galvanic cell to give you the greatest voltage, why? Why would it be hard to create such a galvanic cell?
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Calculate the pZn of a solution prepared by mixing 25.0 mL of 0.0100 M EDTA with 50.0 mL of 0.00500 M Zn2+. Assume that both the Zn2+ and EDTA solutions are buffered with 0.100 M NH3 and 0.176 M NH4Cl.
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An analysis of the inorganic constituents of a raw water yielded
the following results:
Ca^+2= 63 mg/L
Mg^+2= 15 mg/L
Na^+=20 mg/L
K^+= 10 mg/L
CO3^-2= 16 mg/L
HCO3^-1= 189 mg/L
SO4^-2= 80 mg/L
Cl^- =14 mg/L
a) Compute the total hardness
b) Find carbonate and non-carbonate hardness as mg/L CaCO3
Please show step by step solution. Thank you.
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1. Vanadium crystallizes in a body-centered cubic lattice, and the length of the edge of a unit cell is 305 pm. what is the density of V?
2. Vanadium crystallizes in a face-centered cubic lattice, and the length of the edge of a unit cell is 305 pm. what is the density of V?
3. Vanadium crystallizes in a single-centered cubic lattice, and the length of the edge of a unit cell is 305 pm. what is the density of V?
Please explain the works.
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You are designing a system to add CO2 to water to make
carbonated water (sparkling water, like Club Soda or Perrier). If
the gas pumped into the bottle above the water is at a pressure of
2 atmospheres and is composed of 100% CO2, what is the equilibrium
concentration of dissolved CO2 in the water? If the pH of the water
is 5.0, what is the concentration of CO3^-2, HCO3-, and H2CO3 ?
(KH=0.0334 mol/L*atm)
CO2(aq) + H2O<-----> H2CO3
H2CO3 <----> H^+ + HCO3^- pKa=6.35
HCO3^- <------> H^+ + CO3^2- pKa=10.33
Please show step by step solution. Thank you.
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Use tabulated electrode potentials to calculate ΔG∘ for the reaction 2K(s)+2H2O(l)→H2(g)+2OH−(aq)+2K+(aq)
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Explain (giving at least one example) how stable isotopes of oxygen (i.e. 16O and 18O) can be used to measure the paleotemperature of the ocean, specifically based on calcium carbonate in “shells?”
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Enough of a monoprotic weak acid is dissolved in water to produce a 0.0122 M solution. The pH of the resulting solution is 2.64 . Calculate the Ka for the acid.
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In a 1.0× 10–4 M solution of HClO(aq), identify the relative molar amounts of these species from least to most. HNO3, OH^-,H3O^+,NO3^-,H2O
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Use the balanced equation for the combustion of ethane
to complete the table.
| 2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(g) |
| Initially mixed |
0.231 g | 1.056 g | 0.00 g | 0.00 g |
| How much reacts |
g | g | ― | ― |
| Composition of final mixture |
g | g | g | g |
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