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The concentration of Cu2+ ions in the water (which also contains sulfate ions) discharged from a certain industrial plant is determined by adding excess sodium sulfide (Na2S)solution to 0.800L of the water.
The molecular equation is:Na2S (aq) + CuSO4 (aq) ----> Na2SO4 (aq) + CuS (s)
Write the net ionic equation and calculate the molar concentration of Cu2+ in the water sample if 0.0177g of solid CuS is formed.
One cup is equivalent to 237. mL. If 1 cup of oil has a mass of 210. g, what is the density of the oil (in grams per cubic centimeter)?
Individual bonds in a molecule are often polar, molecules as a whole also often are polar because of the ne tsum of individual bond polarities. Which of the following molecules is/are polar? SF4, CCl4, C2H2.
If an unknown forms a silver mirror in the Tollens test, forms a purple color in the Schiff test, produces no precipitate in the iodoform test, has a refractvie index of 1.5250, and forms a semicarbazone melting at 124-126 C
Calculate the molarity and the molality of an NH3 solution made up of 36.5 g of NH3 in 70.0 g of water. The density of the solution is 0.982 g/mL.
Calculate the mass of PbCl2 that will dissolve in 50 mL of water if the solubility product constant is 1.61*10^-5?
Suppose the reaction Ca3(PO4)2 + 3H2SO4 ------ > 3CaSO4 + 2H3PO4 is carried out starting with 103 g of Ca3(PO4)2 and 33.7 g of H2SO4. How much phosphoric acid (H3PO4) will be produced?
0.75g of hydrogen chloride is dissolved in water to make 2.5L of solution. What is the pH of the resulting hydrochloric acid solution.
bone was dissolved in hydrochloric acid giving 45.0 ml of solution containing calcium chloride cacl2. to precipitate
Calculate the amount of of cobalt(II) nitrate hexahydrate [Co(NO3)2*6H2O] needed to prepare 50 mL of a .15 M cobalt(II) nitrate stock solution.
If 50.0 ml of NaOH solution is required to react completely with 1.24 grams KHP, what is the molarity of the Naoh solution?
what is delta s total (entropy change) for the process? latent heat of fusion of water at 0 C is 334 J/g and the specific heat of subcoooled liquid water is 4.226 J/gC.
Explain what happened by using structures and chemical explanation of what did or did not happen.
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