Chemistry Forum

Hello,

can you please tell me how to write the chemical reaction that takes place between magnesium ion and (NH4)2HPO4 as a precipitating reagent.

Thank you.

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...

I'm sorry, but I don't quite understand what you're trying to say. Could you please write a concrete numerical result?

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...

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...

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 ...

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, ...

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...

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?

Thanks, but the problem is that the solutions say the answer is 14 A. Is that possible?

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...

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!

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!

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...

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!