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BaCl2 + Na2SO4 ↔BaSO4 + NaCl- Gravimetic determination of sulfate1) Explain, why adding an excess of Ba+2 will causea more complete precipitation of BaSO4.2) What are three possible errors that could be introduced into this procedure by poor experimneter technique?3) If some of the solid precipitated were actually SrSO4 instead of BaSO4, would the final %sulfate calculated be higher or lower than actual value?Explain.
Methyl orange is an indicator that changes color over a range from pH =3.1 to pH =4.4 . What is Ka of methyl orange
Consider the following system at 100°C: N2O4(g) ?2NO2(g) Kc = 0.36 Predict the direction in which the system will move to reach equilibrium if we start with 0.20 mole of N2O4
What dansylated amino acids would be isolated after reaction of S-F-H-Y-W-C-T-L-C-K-L-I-N-D-S with dansyl chloride an the complete with hydrolysis
needed to titrate 45.25 mL of NaOH. Calculate the moles of NaOH needed for the reaction. Calculate the Molarity of the NaOH solution
A Chem 113 TA prepares a solution by dissolving 3.11 g of solid KOH in enough water to make 100.0 mL of solution. Calculate the molarity of K+ ions in this solution.
Calculate the concentration of Iron(II) ions in a solution that contains 0.10M Fe(NO3)2 and 1.00M NaCN.
Calculate the total mass of the protons and electrons in 19/9F. Use 1.007825 amu as the mass of 1/1H(mass of a proton and an electron). Express your answer in atomic mass units to 6 significant figures.
Need two of the methods for polycyclic aromatic hydrocarbons degradation. One of the method is Photocatalysis but how it works
Calculate the final temperature of an aqueous solution if 30g of CaCl2 is added to 100 mL of water at 23 degrees celcius. Assume that the specific heat of the solution is the same as that of water= 4.184 J*g/celcius
how many moles of sodium hypobromite should be added to 1.00 of 5.0times10-2 hypobromous acid to form a buffer solution
What is the energy uncertainty associated with a short pulse of laser light that lasts for only 4.8 femtoseconds (fs)? Suppose the low energy end of the pulse had a wavelength of 727 .
A lake contains high concentrations of dissolved Mn^2+ and Fe^2+. a. What can you say about the concentration of dissolved nitrate. b. What can you conclude about the concentration of dissolved oxygen. c. What can you say about the form of any sul..
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