The He⁺ ion contains only one electron and is therefore a hydrogen-like ion. Calculate the wavelengths of the first four transitions in the Balmer series of the He⁺ ion. List your answers in increasing transition order by entering the wavelength that corresponds to the first transition on the left. (The Rydberg constant for He is 4.39 × 10⁷ m⁻¹ and the Rydberg constant for H is 1.097 × 10⁷ m⁻¹)

Calculate these wavelengths for the same transitions in an H atom.

The pH of 0.1M NaCl is 7.14. After 1 drop of 0.1M HCl the pH change to 3.59. And after another 1 drop of 0.1M HCl the pH become 3.13.
Why does pH change significantly 7.14 to 3.59? And also why the pH doesn't change very much after another 1 drop of 0.1M HCl (3.59 to 3.13)?

Calculate the pH for each case in the titration of 50.0 mL of 0.110 M HClO(aq) with 0.110 M KOH(aq). Use the ionization constant for HClO.

What is the pH before addition of any KOH?

What is the pH after addition of 25.0 mL KOH?

What is the pH after addition of 40.0 mL KOH?

What is the pH after addition of 50.0 mL KOH

What is the pH after addition of 60.0 mL KOH?

hint: HClO is a weak acid with a Ka of 4.0×10−8. It reacts with strong base to produce Cl

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.

What mass of oxygen will react with 16.6 g of aluminum according to the following reaction?

4 Al + 3 O₂ ? 2 Al₂O₃

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

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.

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.

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?

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.

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.

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.

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.

Use tabulated electrode potentials to calculate ΔG∘ for the reaction 2K(s)+2H₂O(l)→H₂(g)+2OH⁻(aq)+2K⁺(aq)