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In the food-processing lab you are making white rice by removing the rice bran from brown rice. If the bran contains 876 ppb of arsenic and the brown rice contains 432 ppb, what is the concentration in the white rice if you remove 10% of the mass during the milling process?
what mass of Na2CO3 will be required to titrate 75.0 mL of 0.350 M HCl. This is the balanced equation given Na2CO3+2HCl--->2NaCl +H2O+CO2
Calculate the pH at the equivalence point in the titration of 68 mL of 0.10 M methylamine (see Table 15.4) with a 0.20 M HCl solution.
Calculate the concentrations of all species in a 1.08 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10-2 and Ka2 = 6.3× 10-8.
A student made a bottle of 6 M NaCl solution in the morning and then stored it in the refrigerator. In the afternoon, he took out the bottle and found NaCl crystals at the bottom of the bottle. Can you explain why the crystals formed
a 1.0 ounce piece of chocolate contains 15 rm mg of caffeine and a 6.0 ounce cup of regular coffee contains 105 rm mg
At what temperature would a 1.20 M NaCl solution freeze, given that the van't Hoff factor for NaCl is 1.9? K_f for water is 1.86 C/m
determine the final volume of the gas If the gas ocupied 68mL, initally and determine the molarity of the solution
Problem- What does the presence of calcium ions (Ca2+) do to the effectiveness of soap. Devise a method for determining water hardness using soap, and describe how it would work.
Question- Part a) What mass of carbon dioxide is produced from the complete combustion of 8.70Ã-10?3g of methane Part b) What mass of water is produced from the complete combustion of 8.70Ã-10?3g of methane
Calculate the sulfide ion concentration that is required to just start precipitation of CoS from a solution that is 0.10 M in Co2+. For CoS : Ksp = 4 x 10-21
At a particular temperature , 35.0% of ClO2 molecules have speeds exceeding 400 m/s. If ClO2 is decomposed to Cl2 and O2 and the resulting mixture is cooled until the original temperature of the ClO2 is reached
Write chemical equations and corresponding equilibrium expressions for each of the three ionization steps of phosphoric acid. Write chemical equations for first ionization step of phosphoric acid. H3PO4(aq)+H2O(l) H3O+(aq) + H2PO4^- (aq)
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