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Problem- Hard water often contains dissolved Ca2+ and Mg+ ions. One way to soften water is to add phosphates. The phosphate ion forms insoluble precipitates with calcium and magnesium ions, removing them from solution. Suppose that a solution is 0.050 M in calcium chloride and 0.085 M in magnesium nitrate. What mass of sodium phosphate would have to be added to 1.5 L of solution to completely eliminate the hard water ions? Assume complete reaction.
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Question- The corona of the sun emits a spectral line at about 677 m due to the presence of an ionized 57Fe atom (molar mass of 0.0569 kg mol^-1). If the line has a width of 0.053 nm what is the temperature of the corona
Calculate the molarity and the molality of an NH3 solution made up of 37.5 g of NH3 in 70.0 g of water. The density of the solution is 0.982 g/mL.
Write the structural formula of a mixed triglyceride containing the following three acids: linoleic acid
Calculate the wavelength of a photon emitted when the electron in a Li2+ ion relaxes from the n=6 energy level to the n=4 energy level.
The standard reduction potential for a substance indicates how readily that substance gains electrons relative to other substances at standard conditions. Consider the following: Ni2+(aq)+2e- -> Ni(s), E red = -0.23 V Cu2+(aq)+2e- -> Cu(s), E red ..
4HCl(aq) + O2(g)--->2H2O(l) + 2Cl2(g) how many molecules of Cl2 would be formed from the reaction mixture that produces the greatest amount of particles?
what is the pH of the buffer solution and what is the ratio of acid to conjugate base in order to decrease the pH by 1.00 unit from the value calculated of the buffer solution.
The molarity of an aqueous solution of potassium hydroxide is finding out by titration against a 0.138M hydrobromic acid solution. If 27.4ml of the base are required to neutralize 21.6ml of hydrobromic acid explain what the moalrity of the potassi..
Limestone (CaCO3) is used to remove acidic pollutants from smokestack flue gases. It is heated to form lime (CaO), which reacts with sulfur dioxide to form calcium sulfite
Problem- If you wanted to measure the concentration of a particular species in a sample, describe the procedure you would use to do so.
Consider the following mechanism for the oxidation of bromide ions by hydrogen peroxide in aqueous acid solution. H+ + H2O2 ? H3O2+ (rapid equilibrium)
Calculate the hydronium concentration for a solution prepared by dissolving 0.15 mol of benzoic acid (C6H5COOH) and 0.30 mol of sodium benzoate (C6H5COONa) in 1.00 L of solution. (Ka of C6H5COOH = 6.5 x 10-5)
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