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The element chromium is thought to be a cancer causing agent. Chromium in the form of the chromate ion in a water soluble compound presents a risk to humans. We can remove thi srisk by chemically reacting the chromate ion causing the formation of the highly insoluble chromium hydroxide. to do this the chromate containing compound is reacted with solid sodium ditiotite, in a basic environment, according to the skeletal ionic equation: CrO4(-2) (aq) + S2O4 (-2) (aq) {oh-} Cr(OH)3 (s) + SO3(2-) (aq) a. balance the equation in basic b. if 100.l of contaminated water with a concentration of chroate ion of 0.0148 M is to be treated by this method, what mass of sodium dithionate, Na2S2O4 is needed?
We need to make a 4% NaOH solution in ethanol. How much NaOH do we add to 50.0 mL of ethanol to make a 4% NaOH solution. Density of Ethanol=0.789 g/mL molar mass= 46.06844 g/mol and NaOH molar mass= 39.997 g/mol.
Determine the freezing point and calculate the final temperature if initially this iron nail was at temperature of 28 degree Celsius?
For a given chemical reaction, ?H = -32.0 kJ/mol and ?S = -98.0 J/mol*K. Estimate the free energy change for the reaction at 775 C and 1 bar pressure. I believe it to be 70.7 kJ/mol
Give the number of valence electrons of each element and draw the Lewis structure for each molecule.
One thousand kg/h of an ethanol/methanol stream is to be separated in a distillation column. The feed has 40% ethanol and the distillate has 90% methanol. Eighty percent of the methanol is to be recovered as distillate. Determine the % methanol in ..
what effect will that have on the delta T values when the initial value is measured with the thermometer and the latter is measured with the temperature probe? How will this affect the calculated change in heat of that substance?
Combine 15.0 mL of 0.125 M chromium (III) nitrate and 15.0 mL of 0.125 M ammonium carbonate. What is the limiting reactant
For an ensemble consisting of a mole of particles having two energy levels separated by 1000. cm-1, at what temperature will the internal energy equal
The temperature increased by 10.08 oC. Use these data, plus the information given below for CO2 and H2O, to estimate the standard enthalpy of formation,
Use the appropriate standard reduction potentials to calculate the value
All of the following are factors that affect reaction rate EXCEPT a. density of reactants b. presence of a catalyst
Provide a structure for the following compound: UV spectrum: ?max = 272 nm (? = 39,500); EI mass spectrum: m/z = 129 (molecular ion and base peak); IR: 2200, 970 cm-1; 1H NMR: ? 5.85 (1H, d, J = 17 Hz); ? 7.35 (1H, d, J = 17 Hz); ? 7.4 (5H, appare..
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