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Water softeners often replace calcium ions in hard water with sodium ions. Since sodium compounds are soluble, the presence of sodium ions in water does not cause the white, scaly residues caused by calcium ions. However, calcium is more beneficial to human health than sodium because calcium is a necessary part of the human diet, while high levels of sodium intake are linked to increases in blood pressure. The U.S. Food and Drug Administration (FDA) recommends that adults ingest less than 2.4 of sodium per day.
How many liters of softened water, containing a sodium concentration of 4.7×10-2 % sodium by mass, have to be consumed to exceed the FDA recommendation? (Assume a water density of 1.0 g/ml.)
what is the molarity of a solution made when you dilute 35 grams of sodium carbonate to a volume of 3400 ml?
How much of either 5.0 M HCl or 5.0 M NaOH must you add (and which one)? Assume the pka for imidazole is 7.0.
If 4.49 g NaNO3 is dissolved in enough water to make 250 mL of solution, what is the molarity of the sodium nitrate solution
2 NH3(g) + 3 O2(g) + 2 CH4(g) → 2 HCN(g) + 6 H2O(g) If 5.46x10^3 kg each of NH3, O2, and CH4 are reacted, what mass of HCN and of H2O will be produced, assuming 100% yield?
Butane (C4H10) has a heat of vaporization of 22.44 kJ/mol and a normal bioling point of -0.4 celsius. A 250 Ml sealed flask contains 0.55 grams of butane at -22.0 celsius. How much butane is present as a liquid?
Calculate the change in pH of rainwater resulting from an increase in the Pressure of CO2 from 10^-3.5 atm to 10^-3.0 atm due to fossil fuel emissions
Lead (II) nitrate and ammonium iodide react to form lead (II) iodide and ammonium nitrate according to the reaction. Pb (NO3)2 (aq) + 2NH4i (aq) --> Pbi2 (s) + 2NH4NO3(aq)
Example of reducing agent mechanism, Using Curved arrows to symbolize the flow of electrons, write the mechanism for the steps involved in the conversion of 9-fluorenone
The sedimentation coefficient of a certain DNA in 1 M NaCl at 20 oC was measured by boundary sedimentation at 24,630 rpm. The following data were recorded time (min) distance (cm) 16 6.2687 32 6.3507 48 6.4380 64 6.5174 80 6.6047 96 6.6814 A.
What is the equilibrium concentration of hydronium ion in a solution that is 0.041 M in HF and 0.19 M in F1- ion.
mass m in a one dimensional box of length L? If the answer is yes, then express the energy of this trial wavefunction in terms of h, m, and L?
How many moles of Al2S3 are produced using 12.8 grams of Al and 7.59 x 10-2 moles of S8
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