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A 25.0 ml solution of .0600 M EDTA was added to a 57.0 ml sample containing an unknown concentration of V3+. All V3+ present formed a complex, leaving excess EDTA in solution. This solution was back-titrated with a .0440 M Ga3+ solution until all the EDTA reacted requiring 14.0 ml of the Ga3+ solution. What was the original concentration of the V3+ solution?
Calculate the hydrogen ion concentration for an aqueous solution that has a pH of 3.45.
For a particular redox reaction MnO2 is oxidized and Ag+ is reduced to Ag write a balanced equation
Consider the reaction: CO(g)+Cl2(g)===COCl2(g) Keq= 2.9×10^10 at 25 degress celsius A 5.89 -L flask containing an equilibrium reaction mixture has [CO]= 1.4×10^?6M and = 6.3×10^?7M How much COCl2 in grams is in the equilibrium mixture
When a 2.691 g sample of the unknown organic compound is vaporized at 90.0(degrees)C and 708. mmHg it is found to occupy a volume of 1.00L.
Calculate the percent water: mass of water lost / mass of hydrated salt x 100%. E. Write the empirical formula for hydrated alum, based on your experiment.
If the efficiency of the boiler is 91.2%, the efficiency of the turbine is 46.7%, the efficiency of the generator is 98.4%, and one can assume another 5% miscellaneous plant losses, what is the actual efficiency of the overall generating unit?
A 0.2436-g sample of an unknown substance was dissolved in 20.0 mL of cyclohexane. The density of cyclohexane is 0.779g/mL. The freezing-point depression was 2.5ºC. Calculate the molar mass of the unknown substance. (Kf cyclohexane = 20.0ºC/m)
At 25°C, 1.0 g of caffeine is dissolve into 47 ml of water, 18 ml of dichloromethane, into 86 ml of benzene, or into 270 ml of diethyl ether. Which solvent would provide the largest extraction coefficient (KD). Briefly explain.
What is the balanced molecular equation for the reaction. What is the balanced complete ionic equation for the reaction. What is the net ionic equation. Which ions are spectator ions
Which of the following molecules is expected to form hydrogen bonds in the pure liquid or solid phase: ethylene glycol (HOCH2CH2OH), formaldehyde (H2CO), and dimethyl ether (CH3OCH3)?
determine what volume of 3.00m hcl in liters is required to react completely with 0.500l of 0.200m na2co3?a gas sample
The most common source of copper is the mineral chalcopyrite. How many kilograms of chalcopyrite must be mined to obtain 320. of pure copper?
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