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.
Search found 257 matches
- Mon Mar 28, 2022 6:18 am
- Forum: Chemistry forum
- Topic: Stoichiometry
- Replies: 8
- Views: 12761
- Sun Mar 27, 2022 7:48 am
- Forum: Chemistry forum
- Topic: Stoichiometry
- Replies: 3
- Views: 10188
Re: Stoichiometry
A solution of iodine and KI in ethyl alcohol means what. Would you give me examples of iodine of salt?
- Sun Mar 27, 2022 3:13 am
- Forum: Chemistry forum
- Topic: Stoichiometry
- Replies: 3
- Views: 10188
Stoichiometry
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...
- Tue Mar 15, 2022 7:52 am
- Forum: Chemistry forum
- Topic: equivalent weight, molecular weight and formula for the unknown acid
- Replies: 2
- Views: 9435
- Mon Mar 14, 2022 11:18 pm
- Forum: Chemistry forum
- Topic: Find out strong electrolyte , weak electrolyte or non-electrolyte
- Replies: 3
- Views: 9621
Re: Find out strong electrolyte , weak electrolyte or non-electrolyte
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...
- Mon Mar 14, 2022 5:07 am
- Forum: Chemistry forum
- Topic: Solubility and computations of free energy
- Replies: 2
- Views: 8726
Re: Solubility and computations of free energy
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...
- Sun Mar 13, 2022 9:38 pm
- Forum: Chemistry forum
- Topic: Find out strong electrolyte , weak electrolyte or non-electrolyte
- Replies: 3
- Views: 9621
Find out strong electrolyte , weak electrolyte or non-electrolyte
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 (...
- Sun Mar 13, 2022 9:22 pm
- Forum: Chemistry forum
- Topic: Solubility and computations of free energy
- Replies: 2
- Views: 8726
Solubility and computations of free energy
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...
- Thu Mar 10, 2022 10:58 am
- Forum: Chemistry forum
- Topic: equivalent weight, molecular weight and formula for the unknown acid
- Replies: 2
- Views: 9435
equivalent weight, molecular weight and formula for the unknown acid
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 ...
- Wed Dec 22, 2021 9:05 am
- Forum: Chemistry forum
- Topic: Arrangement of metals in order of increasing reduction power
- Replies: 1
- Views: 1819
Arrangement of metals in order of increasing reduction power
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...
- Wed Nov 17, 2021 9:38 am
- Forum: Chemistry forum
- Topic: Question on structure of atom
- Replies: 0
- Views: 30671
Question on structure of atom
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...
- Sat Oct 30, 2021 12:20 am
- Forum: Chemistry forum
- Topic: Differences between electrolytic cells and voltaic cells
- Replies: 5
- Views: 2735
Re: Differences between electrolytic cells and voltaic cells
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?
- Fri Oct 29, 2021 9:57 pm
- Forum: Chemistry forum
- Topic: Differences between electrolytic cells and voltaic cells
- Replies: 5
- Views: 2735
Re: Differences between electrolytic cells and voltaic cells
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...
- Thu Oct 28, 2021 8:24 am
- Forum: Chemistry forum
- Topic: Differences between electrolytic cells and voltaic cells
- Replies: 5
- Views: 2735
Differences between electrolytic cells and voltaic cells
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 ...
- Thu Oct 21, 2021 9:48 am
- Forum: Chemistry forum
- Topic: Rate laws of reactions
- Replies: 3
- Views: 2454
Re: Rate laws of reactions
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.
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.