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Problem- 1) The titration of a 20.0 mL sample of an H2SO4 solution of unknown concentration requires 22.87 mL of a 0.158 M KOH solution to reach the equivalence point. What is the concentration of the unknown H2SO4 solution (in molarity)?
2) Calculate the molarity of a solution made by adding 45.4 g of NaNO3 to a flask and dissolving it with water to create a total volume of 2.50 L.
Rewrite your answer from the stating and prove each step carefully.
student placed 18.5 of glucose in a volumetric flask added enough water to dissolve the glucose by swirling then
What is the magnitude of the change in pH when 0.005 moles of HCl is added to 0.100 L of a buffer solution that is 0.100 M in CH3CO2H and 0.100 M NaCH3CO2?
Calcium metal has a density of 1.55g/cm3 and crystallizes in a cubic unit cell with an edge length of 558.2pm. a. how many Ca atoms are in one unit cell?
Problem- A zero-order reaction has a constant rate of 4.50 x 10^4 M/s. If after 80.0 seconds the concentration has dropped 9.00 x 10^2 M. what was the initial concentration. Express your answer with the appropriate units
What is the expected freezing point of a 0.50 m solution of Li2SO4 in water? Kf for water is 1.86°C/m.
In thin layer chromatography (TLC) what does the Rf (retention factor) value represent. What is a large Rf value telling us. Can an Rf value be too small or large. What advantages and disadvantages does TLC have
Find the mass of AlCl3 that is produced when 25.Og of Al2O3 react with HCl according to following equation Al2O3+6HCl-
Each was extracted with three 5-mL aliquots of CCl4 containing an excess of 8-hydroxyquinoline. The extracts were diluted to 25 mL and their fluorescence was measured. What is the concentration of the zinc in the unknown solution?
Generally speaking, as you go across a period in the periodic table, the effective nuclear charge (Zeff) increases because each successive element contains more protons in the nucleus than the previous element and the outer electrons are all in th..
A mixture of 13.1 grams of Zn and 22.0 g I2 is reacted to completion in a closed, evacuated container. What are the contents of the contianer after this reaction
methane flowing at 2 mol/min is adiabatically compressed from 300 K and 1 bar to 10 bar. What is the minimum work required? Use Departure Functions.
What is the possible chemical explanation for this? I understand that a reaction using a thiamine catalyst at room temperature for 48 hours may lead to lower yield due to catalyst decomposition, but I'd like to know a more technical explanation.
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