Basic principles of qualitative analysis - Inorganic Chemistry, analytical chemistry
Assumed we get any sample to find out its compounds or chemical elements. Our first step shouldn't be to switch on the "state of the art" analysis equipment. We should start to solve the basic questions. These information will help us later to specify the final methods. Main attention is payed to the following points: * source ...continues
Systematic Treatment of Equilibrium
The attached problems in MS Word involve the systematic treatment of problem solving in chemical equilibria. The college course is Quantitative Analysis. Excellent knowledge of some inorganic and organic acids and the systematic approach in solving chemical equilibria are required.
Find the activity(not the activity coeefficien)t of the (C3H7)4N+ (tetrapropylammonium) ion in a solution containing 0.005 M (C3H7)4N+Br- plus 0.005 M (CH3)4N+Cl-. Activity coefficients : Ionic strength .001 .005 .01 .05 0.1 (C3H7)4N+ : .966 .931 .912 .85 .82 CH3)4N+: ...continues
Calculation of Amounts of Constituents in Acid / Base Equlibrium
I am a winemaker and in the course of my work I simply do not understand how to do a calculation of this sort. We usually express acidity (in wine) in terms of titratable acidity in grams tartaric acid per liter. Here is the information that I have: If 500 mg/L of lactic acid is added to distilled water and NaOH is added unt ...continues
Acid Equilibrium; Titratable Acidity
If 500mg/L lactic acid is added to pure water and you add NaOH until the pH = 3.1, what are the final amounts of each species in the acid equilibrium? What is the titratable acidity? The formula for lactic acid is C3H603, with a dissociation constant, pKa = 3.86. The formula for tartaric acid is C4H606. We usually defi ...continues
Finding the concentration of whiskey in m/v%
As part of my project i have to find the concentration of cask strength whiskey in terms of %w/v. I know the formula for this((mass of solute/vol of sol)*100) but am having trouble calculating the rest to get to this - approx 100cm3 of water added to 10cm3 of whiskey - then made up to the mark of 500cm3 flask with water. 20c ...continues
Hi, I have tried this problem, but I can not seem to get it to work out - don't know if my dilutions are wrong, or if I am working it out all wrong. Can someone help? Thanks Cobalt2+ can be analysed by treatment with a known excess of thiocyanate in the presence of pyridine according to the equation: Co2+ + 4C5H5N + 2SCN- - ...continues
balanced equation for potassium iodide solid plus hydrogen peroxide
Balanced equation for potassium iodide solid plus hydrogen peroxide. What are all the steps in this reaction that finally produces oxygen?
2 AgNo3 (aq) + Na2S (s) ---------->Ag2S (s) + 2 NaNO3 (aq) CaCO3 (s) + HCl(aq) --------------> CO2 (g) + CaCl2 (aq) + H2O (l) If 25.0ml of 0.500M AgNO3 is mixed with 50.0ml of 0.100M Na2S how many grams of Ag2S will form? What will be the resulting molar concentration of NaNO3 left over in the reaction mixture? A che ...continues
EDTA complexometric titrations
The ion Mn+ (100.0 mL of 0.05 M metal ionbuffered to pH 9.00) was titrated with 0.05 M EDTA What is the equivalence volume, Ve in millimeters? Calculate the concentration of free metal ion at V= ½ Ve What fraction of (...) of free EDTA is in the form of Y4- at pH 9.00?
