Search found 31 matches
- Mon Jun 12, 2023 12:00 am
- Forum: Chemistry forum
- Topic: Activity coefficient
- Replies: 2
- Views: 2047
Activity coefficient
Hello, I would like to know if I also have to square the activity coefficient in addition to the equilibrium constant of silver, if I want to express the solubility or solubility product Ag2SO4 . K sp = γ(Ag+)square *[Ag+]square *γ(SO42')*[SO42-] or K sp = γ(Ag+)*[Ag+]square *γ(SO42')*[SO42-] Thanks...
- Mon May 08, 2023 5:24 am
- Forum: Chemistry forum
- Topic: Solubility
- Replies: 3
- Views: 2225
Re: Solubility
I'm sorry, but I don't quite understand what you're trying to say. Could you please write a concrete numerical result?
- Mon May 08, 2023 2:26 am
- Forum: Chemistry forum
- Topic: Solubility
- Replies: 3
- Views: 2225
Solubility
Please help me with this task: The solubility product of As2S3 is 4.0.10−29 (T = 25 °C). a) Calculate the number of S{2-} ions in 70.0 L of saturated As2S3 solution at 25 °C. b) In 70.0 L of Na2S solution of unknown concentration, a maximum of 0.545 mg of As2S3 can be dissolved at 25 °C. Calculate t...
- Sat May 06, 2023 6:59 am
- Forum: Chemistry forum
- Topic: Titration
- Replies: 3
- Views: 2148
Titration
Please help me with the following task: 20.0 mL of acetic acid solution is titrated with 0.0510 M sodium hydroxide solution. a) Calculate the concentration of acetic acid if the pH at the equivalence point is 8.51! Assume additivity volume. Ka(CH3COOH) = 1.75·10-5 b) Calculate the volume of NaOH add...
- Tue Mar 14, 2023 8:34 am
- Forum: Chemistry forum
- Topic: Solubility of crystal hydrates
- Replies: 4
- Views: 3402
Solubility of crystal hydrates
Please answer my query concerning the solubility of crystal hydrates: Add 80.0 mL of a 15.0% CuSO4 solution with a density of 1.137 g/mL (T = 20 °C) to 30.0 g of solid CuSO4*5H2O and mix thoroughly. CuSO4 solubility (T = 20 C) = 20.8 g / 100 g water a.) Determine how many grams of CuSO4*5H2O remain ...
- Thu Dec 08, 2022 1:35 pm
- Forum: Chemistry forum
- Topic: Questions from general chemistry - mixing of solutions and balancing of equations of redox reactions
- Replies: 3
- Views: 3149
Re: Questions from general chemistry - mixing of solutions and balancing of equations of redox reactions
I appreciate your work, but I'm afraid I don't entirely comprehend how you arrived at the conclusion. What is the origin of the numerals 10,4 and 12? I'm also curious in the redox process and how it would balance, say, if it had hypothetical significance. In the book where the reaction was written, ...
- Thu Dec 08, 2022 7:23 am
- Forum: Chemistry forum
- Topic: Questions from general chemistry - mixing of solutions and balancing of equations of redox reactions
- Replies: 3
- Views: 3149
Questions from general chemistry - mixing of solutions and balancing of equations of redox reactions
Hello, I have two questions: 1. We want to prepare a 20.0% KOH solution. We have at our disposal a 9.96% KOH solution with a density of 1.090 g mL–1 (T = 20 °C) and a 32.0% KOH solution with a density of 1.310 g mL–1(T = 20 °C). a.) Calculate in what volume ratio we must mix the 9.96% and 32.0% solu...
- Sun May 08, 2022 7:11 am
- Forum: Chemistry forum
- Topic: Electrolysis
- Replies: 5
- Views: 13305
Re: Electrolysis
Even I calculated it, the result is the same as yours. This is an example from a chemical competition, and the official answer is 14 A. But now I'm not sure what to do, so I turned to this forum for help. So you don't believe it's possible to achieve 14 amperes in any case?
- Sat May 07, 2022 11:36 pm
- Forum: Chemistry forum
- Topic: Electrolysis
- Replies: 5
- Views: 13305
Re: Electrolysis
Thanks, but the problem is that the solutions say the answer is 14 A. Is that possible?
- Fri May 06, 2022 5:52 am
- Forum: Chemistry forum
- Topic: Electrolysis
- Replies: 5
- Views: 13305
Electrolysis
31 g of pure K3PO4 are dissolved in 250 g of distilled water at a density of 1 g / mL. The resulting solution is then electrolyzed for 14 hours under constant electric current. After electrolysis, the mass fraction of salt in the solution increases by 3.4%, and the mass and appearance of the electro...
- Tue Jan 18, 2022 1:19 pm
- Forum: Chemistry forum
- Topic: A mixture of two ionic compounds
- Replies: 1
- Views: 1883
A mixture of two ionic compounds
Hello,
I would like to ask you a question about a mixture of two ionic compounds:
If we dissolve equal amounts of NaCl and KI in water and then evaporate the solvent, is it possible that I end up getting some NaI and KCl as well? Why yes or why not?
Thank you in advance!
I would like to ask you a question about a mixture of two ionic compounds:
If we dissolve equal amounts of NaCl and KI in water and then evaporate the solvent, is it possible that I end up getting some NaI and KCl as well? Why yes or why not?
Thank you in advance!
- Wed Jan 12, 2022 9:25 am
- Forum: Chemistry forum
- Topic: Nernst equation
- Replies: 1
- Views: 1852
Nernst equation
Hello,
I would like to ask you a question about Nernst equation. So this is the correct notation of Nernst's equation if I want to calculate the pH measured with a pH meter?:
\( E= E0 + (2,3RT)/(nF) * pH \)
So does a pH meter use this equation to calculate pH?
Thank you in advance!
I would like to ask you a question about Nernst equation. So this is the correct notation of Nernst's equation if I want to calculate the pH measured with a pH meter?:
\( E= E0 + (2,3RT)/(nF) * pH \)
So does a pH meter use this equation to calculate pH?
Thank you in advance!
- Sat Jan 08, 2022 12:45 pm
- Forum: Chemistry forum
- Topic: Sample preparation for flame photometry
- Replies: 0
- Views: 29482
Sample preparation for flame photometry
Hello, I would like to ask you a question about preparing a sample for flame photometry: The calibration curve is in the range 0 - 20 mg Na{+} / L. The liquid sample contains only 0.55 mg Na{+} / L. How will you prepare the sample until the signal in the flame photometric analysis falls into the cen...
- Sun Dec 05, 2021 8:32 am
- Forum: Chemistry forum
- Topic: Titrations of the mixture of bases
- Replies: 1
- Views: 2017
Titrations of the mixture of bases
Hello,
I would like to ask you a question about titration:
To neutralize 1 gram of a sample containing KOH and Ba(OH)2 13.5 mL of hydrochloric acid at a concentration of 1 mol/L was used. What is the composition of the sample?
Thank you in advance!
I would like to ask you a question about titration:
To neutralize 1 gram of a sample containing KOH and Ba(OH)2 13.5 mL of hydrochloric acid at a concentration of 1 mol/L was used. What is the composition of the sample?
Thank you in advance!
- Fri Nov 19, 2021 9:46 am
- Forum: Chemistry forum
- Topic: Titration of mixture of strong and weak acid
- Replies: 1
- Views: 2046
Titration of mixture of strong and weak acid
Hello, I would like to ask you a question about titration of mixture of strong and weak acid: 50.0 ml of a solution containing HCl and a weak acid HX consume 48.7 ml of 0.115 M NaOH when titrated to phenolphthalein. Titrate the other 50 ml to methyl orange and consume 17.4 ml of base. What is the mo...