Chemistry Forum

My answers:

a)H3AsO4 + 3NaOH → Na3AsO4 + 3H2O

b) 0.07 M H3AsO4 (25 mL)

c)0.249 g of Arsenic acid is present in the solution.

d) 82.9%

I cann't assure you that these answers are correct. Let the moderator decide it.

A solution of iodine and KI in ethyl alcohol means what. Would you give me examples of iodine of salt?

The antiseptic tincture of iodine is a solution of iodine and KI in ethyl alcohol(CH3CH2OH). When a sample of tincture of iodine weighing 5.000 g is diluted with water and titrated with 0.1500 M Na2S2O3 solution, 19.75 mL of the latter is required. The reaction is I2 + 2 Na2S2O3 → 2NaI + Na2S4O6 Wha...

Correct answer.

Strong electrolytes:(a) KBr (b) NH4Cl (f) NaC2H3O2 (h) HClO4 (j)CaO (k) NaOH (o) NH4C2H3O2(r)MgI2 Weak electrolytes: (c)CH3NH2 (d)HCN (e)CO2 (g)HCOOH (n) SO2 (s) HF Non-electrolytes: (i) C6H12 (l) CH3COCH3 (m) CH3CH2OH (p) CH3OCH3 (q) CH3CH2CO2CH3 (t)CH3CH2Cl I am doubtful about (q). It is a 2- Meth...

AgF solubility: AgF(s) \rightarrow Ag^+(g) + F^-(g) \Delta {H} = 967kJ/mol Ag^+(g) + F^- (g) \rightarrow Ag^+ (aq) + F^- (aq) \Delta{H} = 987 kJ/mol ___________________________________________________________________________________ AgF(s) \rightarrow Ag^+ (aq) + F^-{aq} \Delta{H}_{solution}= -20 k...

Designate each of the following compounds as a strong electrolyte, weak electrolyte or nonelectrolyte: (a) kBr (b) NH4Cl (c) CH3NH2 (d) HCN (e) CO2 (f) NaC2H3O2 (g) HCOOH (h)HClO4 (i) C6H12 (j) CaO (k) NaOH (l) CH3COCH3 (m) CH3CH2OH (n) SO2 (o)NH4C2H2O2 (p) CH3OCH3 (q) CH3CH2CO2CH3 (r) MgI2 (s) HF (...

From the following thermodynamic data (at 25℃), compute the free energy of solution for silver fluoride and silver chloride at 25℃. On the basis of your answers, comment on the relative solubilities of two compounds: For AgF : Lattice energy = 967 kJ/mol Heat of hydration = 987 kJ/mol Entropy of sol...

A solution of 3.15 g of an acid dissolved in 100 g of benzene boils at 80.985 ℃ ( the boiling point of pure benzene is 80.099 ℃). A 0.2145- g sample of the same acid requires 45.22 ml of a 0.1054 M of sodium hydroxide(NaOH) solution for complete neutralization. Complete combustion of 1.004 g of the ...

You are given aqueous solutions of AgNO3, Cu(NO3)2, Mg(NO3)2, Fe(NO2)3, Zn(NO3)2, and Ni(NO3)2. You also have available the free metal of each of the six cations. Using only these materials, can you suggest a chemical method for arranging the metals in order of increasing reducing power? How to answ...

An x-ray photoelectron spectroscopy experiment with an unidentified element, X, displays an emission spectrum with four distinct kinetic energies: 5.9 × 10⁻¹⁷ J,2.53 × 10⁻¹⁸ , 2.59 × 10⁻²⁰ J, 2.67 × 10⁻²⁰ (Assume the incident light has sufficient energy to eject any electron in the atom.) (a)Name al...

After reading above table, we can say E°/V for the reaction Zn(s) → Zn²⁺(aq) + 2 e⁻ is +0.76. Is this tabulated information wrong?

In Daniell cell, which is also called voltaic cell or galvanic cell, Redox reaction takes pace as follows: O: Zn(s) → Zn²⁺(aq) + 2e⁻ E°/V= +0.76 Anode with (-) sign R: Cu²⁺(aq) + 2e⁻ → Cu(s) E°/V = 0.34 Cathode with (+) sign Add the half-reactions together. The two half-reactions can be combined jus...

Voltaic Cells a)Do not require a power source. b)Convert chemical potential energy into electrical energy. c)The redox reaction is spontaneous. (The cell potential is positive and the change in Gibb's free energy is negative) d)The reaction with the lower standard reduction potential is utilized as ...

Author of my chemistry notes explains as follows:

Rusting is a heterogeneous process. Iron powder has a greater surface area than a iron nail of a same mass. Therefore , agents responsible for rusting may attack more iron sites at the same time on the iron powder sample.