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The concentration of iron(III) can be determined by adding excess thiocyanate (SCN-) to an aqueous solution. This results in the formation of the highly colored FeSCN2+ complex ion. To do this analysis, a standard solution containing 5.00x10^-5 M Fe3+ was prepared. After addition of excess SCN-, the absorption of the standard solution =0.363 at 580 nm.
To determine [Fe3+] in an unknown solution, 1.00 mL of the solution was diluted to 50.0 mL. After addition of excess SCN-, the absorption of the standard solution =0.193 at 580 nm. What is the [Fe3+] in the ORIGINAL (UNDILUTED) solution?
An aqueous CaCl2 solution has a vapor pressure of 83.0 mmHg at 50 degrees celsius . The vapor pressure of pure water at this temperature is 92.6 mmHg.
Detrmine What mass of lithium (in g) is needed to react completely with 57.9 mL of Nitrogen gas at Standard atmospheric conditions?
Consider a 2430-lb automobile clocked by law-enforcement radar at a speed of 85.5 mph (miles/hour). If the position of the car is known to within 5.0 feet at the time of the measurement, what is the uncertainty in the velocity of the car?
What would the major product of the reaction be if t-butyl alcohol was combined with acetic acid in the presence of H2SO4?
what will the pH be after mixing the 100 ml of HCl solution and the solid NaOH together? Assume the addition of NaOH does not change the volume. (Molar Mass NaOH= 40.00 g/mole : Molar Mass HCl = 36.46 g/mole
What is the solubility product constant? Given Ksp = 1.1 x 10^-3 for BaF2(s), calculate the molarity of Ba+2 in a saturate solution of BaF2 (at equilibrium).
If a water sample has a phosphate concentration of 2.0 x 10-6 M, at what calcium ion level will a precipitate of Ca3(PO4)2 begin to form if the Ksp = 1 x 10-25
calculate the buffer capacity of a 0.05m salicyclic acid solution at pH7. at what pH is the buffer capacity maximum?
The solubility product of Mg(OH)2 is 1.2 x 10-11. What minimum OH- concentration must be attained to decrease the Mg2+ concentration in a solution of MgCl2 to less than 1.0 x 10-9 M.
calculate the final pressure and the number of moles of H2 in each flask
What mass of propane gas, C3H8, will occupy 860. mL at 880. mm Hg and 81.0°C?
When the following reaction is balanced in basic solution using the lowest possible whole number coefficients, the coefficient of H2O will be: H2O2(aq) + ClO2(aq) --> ClO2-(aq) + O2(g)
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