04/14/23

Complete and balance the following redox reaction in basic solution. Be sure to include the proper phases for all species within the reaction.
IO3- + Re > ReO4- + IO-
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04/14/23

Complete and balance the following redox reaction in basic solution
MnO4- + C2O4-2 > MnO2 +Co2
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04/13/23

Chem post lab 10
When the Hg2+ concentration is 1.25 M, the observed cell potential at 298K for an electrochemical cell with the following reaction is 2.577V. What is... more
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04/13/23

What is the pH of a solution prepared by mixing 50.00 mL of 0.10 M NH3 with 10.00 mL of 0.10 M NH4Cl? Assume that the volume of the solutions are additive and that Kb = 1.8 × 10-5 for NH3.
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04/13/23

If a chemist wishes to prepare a buffer that will be effective at a pH of 3.00 at 25°C, the best choice would be an acid component with a Ka equal to
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04/12/23

Question in description
In the process of identifying an unknown liquid it was necessary to determine it's molecular weight. The Dumas method was chosen for this measurement. It was found that at a temperature of 98°C and... more
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04/12/23

The standard cell potential E°(cell) is +0.34 V for the redox reaction 2 In(s) + 6 H⁺(aq) → 2 In³⁺(aq) + 3 H₂(g). Determine E° for the half-reaction In³⁺(aq) + 3 e⁻ → In(s).
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04/12/23

Acids and Bases
What is the equilibrium constant, K, for the reaction between HCN (Ka = 6.2 x 10⁻¹⁰) and OH⁻ at 25 °C?
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04/12/23

A 1.00 L solution saturated at 25 oC with lead(II) iodide contains 0.54 g of PbI2. Calculate the solubility product constant for this salt at 25 oC.
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04/12/23

calculate the ksp value
(a) The molar solubility of PbBr2 at 25 oC is 1.0x10-2 mol/L. Calculate Ksp. (b) If 0.0490 g of AgIO3 dissolves per liter of solution, calculate the solubility product constant. (c) Using the... more
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04/12/23

Buffer questions

You are asked to prepare a pH = 4.00 buffer starting from 1.50 L of 0.0200 M solution of benzoic acid (C6H5COOH) and an excess of sodium benzoate (C6H5COONa). (a) What is the pH of the benzoic... more
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04/11/23

The gas is in a sealed can is at a pressure of 3.00 atm at 25 degrees Celsius. What would the gas pressure in the can be at 52.0 degrees Celsius.
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04/11/23

Complete and balance the following half-reaction in basic solution. Be sure to include the proper phases for all species within the reaction. Cr₂O₇²⁻(aq) → Cr³⁺(aq)
Complete and balance the following half-reaction in basic solution. Be sure to include the proper phases for all species within the reaction. Cr₂O₇²⁻(aq) → Cr³⁺(aq)
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04/11/23

Complete and balance the following redox reaction in basic solution. Be sure to include the proper phases for all species within the reaction. IO₃⁻(aq) + S²⁻(aq) → IO⁻(aq) + SO₂(g)
Complete and balance the following redox reaction in basic solution. Be sure to include the proper phases for all species within the reaction. IO₃⁻(aq) + S²⁻(aq) → IO⁻(aq) + SO₂(g)
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04/11/23

Calculate the pH of a 0.025 M CH3COO- solution? (Ka for CH3COOH = 1.8x10-5)
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04/11/23

Calculate the molar concentration of OH- ions in a 0.724 M solution of hypobromite ion (BrO-: Kp = 4.0x10-6). What is the pH of this solution?
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04/11/23

Find pH of solution
The active ingredient in aspirin is acetylsalicylic acid (HC9H7O4), a monoprotic acid with Ka = 3.3x10-4 at 25oC. What is the pH of a solution obtained by dissolving two extra-strength aspirin... more
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04/11/23

If a solution of HF (Ka = 6.8x10-4) has a pH of 3.65, calculate the concentration of hydrofluoric acid.
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04/10/23

Determine the equilibrium constant for a reaction at 230.0 K if ∆G° =-12.20 kJ/mol. (R = 8.314 J/mol ･ K)
Determine the equilibrium constant for a reaction at 230.0 K if ∆G° =-12.20 kJ/mol. (R = 8.314 J/mol ･ K)
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04/10/23

What is the solubility of Ca(OH)₂ in 0.810 M Ba(OH)₂? Ksp for Ca(OH)₂ is 6.50 × 10⁻⁶. Ba(OH)₂ is a strong base.
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04/10/23

A solution containing 1.90 g of a diprotic acid H₂C₃H₂O₄ (malonic acid) was titrated with 45.5 mL of NaOH to reach the second equivalence point. What is the concentration of the NaOH solution?

(MW_malonic acid = 104.06 g/mol)
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04/10/23

How many moles of HCl were neutralized by the antacid tablet?
Aluminum hydroxide is a base that is the active ingredient in some over-the-counter antacids. Suppose you have 29.0mL of 0.180M HCl solution in a flask and you add an antacid tablet to the HCl.... more
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04/09/23

Find pH of acids
]Calculate the pH of each of the following strong acid solutions: a) 0.0167 M HNO3, b) 0.225 g of HClO3 in 2.00 L of solution, c) 15.00 mL of 1.00 M HCl diluted to 0.500 L, d) a mixture formed by... more
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04/09/23

At the freezing point of water (0oC), Kw = 1.2x10-15, Calculate [H+] and [OH-] for a neutral solution at this temperature.
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04/08/23

40.0 mL of 0.200 M benzoic acid is titrated with 0.200 M NaOH (aq). What is the pH...

a) of the acid solution initially? my answer: pH = 0.699b) of the acid solution halfway to the equivalence point? my answer: pH = 1.18c) 5.0 mL before the equivalence point? my answer: pH = 1.00d)... more
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