Calculate the concentration of all species present in a 0.01 M aqueous solution of ammonia. The pKa of the ammonium ion is 9.24.

1)Calculate [H+] (express the result in molar units using three significant figures and scientific notation).

2)Calculate [OH-] (express the result in molar units using three significant figures and scientific notation).

3)Calculate [NH+4] (express the result in molar units using three significant figures and scientific notation).

4)Calculate [NH3] (express the result in molar units using three significant figures and scientific notation)

5)What is the pH of the solution?

A 0.450-gram sample of impure CaCO3(s) is dissolved in 50.0 mL of 0.150 M HCl(aq). The equation for the reaction is:

CaCO_3(s) + 2 HCl_(aq) ? CaCl_2(aq) + CO_2(g) + H₂O_(l)

The excess HCl(aq) is titrated by 7.65 mL of 0.125 M NaOH(aq). Calculate the mass percentage of CaCO3(s) in the sample.

Separating and Identiying Mixtures by Gas Chromatography Lab 3. For each parameter listed, explain whether or not a change in the parameter will have an effect on the retention time of a compound. (a) injector temperature (b) column temperature (c) detector temperature (d) length or type of column (e) size or injected sample (f) detector attenuation Please explain. Thank you so much.

The acid-dissociation constant for benzoic acid (C6H5COOH) is 6.3×10−5.

A. Calculate the equilibrium concentration of H3O+ in the solution if the initial concentration of C6H5COOH is 5.1×10⁻²M

B. Calculate the equilibrium concentration of C6H5COO− in the solution if the initial concentration of C6H5COOH is 5.1×10⁻² M .

C. Calculate the equilibrium concentration of C6H5COOH in the solution if the initial concentration of C6H5COOH is 5.1×10⁻² M .

Self-test 9A.3 The emission spectrum of atomic deuterium shows lines at 15 238, 20 571, 23 039, and 24 380 cm−1, which correspond to transitions to the same lower state. Determine (a) the ionization energy of the lower state, (b) the ionization energy of the ground state, (c) the mass of the deuteron (by expressing the Rydberg constant in terms of the reduced mass of the electron and the deuteron, and solving for the mass of the deuteron).

Answer: (a) 328.1 kJ mol−1, (b) 1312.4 kJ mol−1, (c) 2.8 × 10−27 kg, a result very sensitive to

A student designs an ammeter (a device that measures electrical current) that is based on the electrolysis of water into hydrogen and oxygen gases. When electrical current of unknown magnitude is run through the device for 2.50 min , 14.4 mL of water-saturated H2(g) is collected. The temperature and pressure of the system are 25 ∘C and 715 torr .

Calculate the magnitude of the current in amperes if the number of moles of hydrogen gas produced is 5.36×10−4 mol .

2H2O----> 2H2(g) + O2(g)

Show reaction formula as well as if a product is created

1.)Potassium sulfate with Copper (ii) Chloride

2.)Potassium sulfate with Calcium Chloride

3.)Potassium sulfate with Magnesium Chloride

4.)Potassium sulfate with Iron (ii) Chloride

Determine the pH of the solution of 100 mL of 0.150 M benzoic acid, HC7H5O2 (Ka=6.3x10-5 ). To this 25.0 mL of 0.400 M KOH is added, calculate the pH of the resulting solution. In a second step an additional 12.5ml of 0.400M KOH is added, calculate the pH of the resulting solution.

For each strong base solution, determine [H3O+], [OH−], pH, and pOH.

A)8.89×10⁻³ M LiOH

[OH−],[H3O+] =

b)8.89×10⁻³ M LiOH

pH,pOH=

C)1.15×10⁻² M Ba(OH)2

[OH−],[H3O+]=

D)1.15×10⁻² M Ba(OH)2

pH,pOH =

E)1.8×10⁻⁴ M KOH

[OH−],[H3O+]=
F)1.8×10⁻⁴ M KOH

pH,pOH =

G)4.9×10⁻⁴ M Ca(OH)2

[OH−],[H3O+] =

H)4.9×10⁻⁴ M Ca(OH)2

pH,pOH =

A different derivation of the freezing point depression begins with the expression

ln x_A = −∆fusG/RT
and uses the Gibbs-Helmholtz equation. Make the substitution and integrate over appropriate limits to derive the freezing point depression equation. Be sure to state any assumptions you make.

Polystyrene has been shown to be soluble in certain terpinene solvents. From the evidence below, determine the enthaply of vaporization of the terpinene. (a) Dissolving 2.86 mL of benzene in 50.0 g of the terpinene raises the boiling point from 174.8◦C to 177.53◦C. (b) Dissolving 2.14 g of the terpinene in 30 mL of benzene increases the boiling point of benzene to 355.8K. (c) Benzene has a ∆vapH = 32.3 kJ·mol−1, a density of 0.877 g·mL−1, and a normal boiling point of 353.3K. When 13.36 grams of the polystyrene are added to 1 L of the terpinene at 200◦C, the osmotic pressure is 3.96 × 10−3 atm. Determine the molar mass of the polystyrene. Approximately how many styrene molecules are in a strand?

Potassium tetraiodomercurate (K2HgI4) is aqueous solution goes by several names, including Nesslers reagent and Mayers reagent. It is an effective test for organic alkaloids and ammonia. A typical batch is made by dissolving 1.36 g of mercuric chloride and 5.00 g of potassium iodide in 20.0 mL of water. (a) Calculate the molal concentration of K2HgI4 in the solution. (b) Calculate the cryoscopic constant for water. (c) This solution has a freezing point of 271.74K. Calculate the molality based on this observation. Explain what is happening.

A beaker with 2.00×10^2 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 6.60 mL of a 0.400 M HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.740

in urinalysis when testing for sugar why would sugar give a positive or negative result

A 1.000 L sample of HCl gas at 25∘C and 732.0 mm Hg was absorbed completely in an aqueous solution that contained 6.948 g of Na2CO3 and 246.0 g of water. A.What is the pH of the solution? B.What is the freezing point of the solution? C.What is the vapor pressure of the solution? (The vapor pressure of pure water at 25 ∘C is 23.76 mm Hg.)