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At pH 12, magnesium hydroxide is insoluble and does not react with EDTA. The titration of a hard water sample at pH 12 thus yields results for calcium only. A 250.0-mL sample of tap water was adjusted to pH 12 and titrated with 0.01049 EDTA using calcein indicator, requiring 21.77 mL to reach the endpoint. A 200.0-mL sample of the same tap water required 47.86 mL of the standard EDTA for titration at pH 10 using calmagite indicator. Calculate the molar concentration of Mg2+ in the tap water
What is the molecular weight of a gas if a 31.0 g sample has a pressure of 836 mm Hg at 25.0°C in a 2.00 L flask? (R= 0.0821 L atm/mol K)
What is the most important extra step that has to be included in the first approach technique for assigning electrons in a heteronuclear diatomic molecule?
Use the appropriate standard reduction potentials to calculate the value of k at 25 degrees celcius
Which of the following is true about ionic bonds?
When an 80.0 liter vessel containing 2.00 mole of NO2(g) was heated to 200oC, 6% of the NO2(g) decomposed to NO(g) and O2(g). What is Kc for the reaction at this temperature?
A wastewater treatment plant discharges treated sewage into a river, the effluent contains a daily average of 15mg/L of NH4+. The rate constant of NH4+ bio-consumption is 0.03 1/d
If you have 15mL of 0.1 M NaC2H3O2, and the pH is 7.0. What would the Kb be for this reacton
What is the experimental yield (in g of precipitate) when 18.6 mL of a 0.634 M solution of barium hydroxide is combined with 19.5 mL of a 0.558 M solution of aluminum nitrate at a 85.4% yield
A 4.50-g sample of LIL at 25.oC dissolves in 25.0 mL of water also at 25.0C. The final equilibrium temperature of the resulting solution is 60.8C. What is the enthalp of solution of LICL expressed in kilojoules per mole?
If you fill the larger tank with oxygen to a pressure of 155atm , to what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time? Assume ideal behavior for all gases.
sulfate dissolves as follows: Na2SO4(s) → 2Na+(aq) + SO42- (aq). How many moles of Na2SO4 are required to make 1.0 L of solution in which the Na concentration is 0.10 M?
What exactly is the reduction of alkynes? I just understand that it is a method for synthesizing alkenes. Why are the leaving groups for E2 reactions not as good as E1 reactions?
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