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The hydrated salt Na2Co3. xH2o undergoes 63% loss in mass on heating and become anhydrous. The value of x is;
Estimate the osmotic pressure in 0.5 g/l solution of sucrose in water at 25 oC.
Estimate the concentration of CO32- ions, if potential of the electrode MnCO3/ Mn,CO32- relatively to standard hydrogen electrode is -1.285 V. E0MnCO3/Mn,CO32- = - 1.480 V.
Estimate pH in 0.5 M solution of Ammonium sulfate (pKb=4.75).
A reaction is catalyzed by an enzyme with parameters k=75 s-1, KM=24·10-6 M and concentration [E]0= 2.5·10-6 M. The initial concentration of the substrate is [S]0= 8·10-4 M. Estimate initial reaction rate. Find the substrate’s concentration providing 4-fold decreasing of the reaction rate.
Estimate the concentration of Cadmium (II) ions over the sediment CdCO3, KS=1.0·10-12 M2. 10. The stability constant of the complex of {1-Methyl-2-[5-(5-methyl-isoxazole-3-yl-amino)
The stability constant of the complex of {1-Methyl-2-[5-(5-methyl-isoxazole-3-yl-amino)-1,2,4-thiadiazole-3-yl]-1-methyl-ethyl}-(2,2,6,6-tetramethyl-piperidine-4-yl)-amine (X) with Carboxymethyl-β-cyclodextrin (CM-β -CD) is β=292 M-1. Estimate the concentration of free substance X if its initial concentration is 0.01 M and CM-β -CD concentration is 0.4 M.
A hittorf cell filtered with Ag/Agcl electrode is filled with Hcl solution that contain 0.3856×10–3gHcl/g water. A current of 2.00A is passed for exactly 3hours.the solution are withdraw,weight and analysed.the total weight of a cathode solution is 51.7436g,it contains 0.0267g of Hcl.the anode solution weight 52.0461g and contains 0.0133g of Hcl.what is the transference number of the H ion?
A hittorf cell filtered with Ag/Agcl electrode is filled with Hcl solution that contain 0.3856×10–3gHcl/g water. A current of 2.00A is passed for exactly 3hours,the solution are withdraw,weight and analysed.the total weight of a cathode solution is 51.7436g,it contains 0.0267g of Hcl.the anode solution weight 52.0461g and contains 0.0133g of Hcl.what is the transference number of the H ion?
How many coulombs of charge pass through a cell if 2.40 amperes of current are passed through the cell for 85.0 minutes?
