II. Iodine is essential for the synthesis of growth- regulating thyroid hormones. It can be absorbed by the body as iodide anion, I. Illustrate how the polar water molecules are oriented towards the iodide ion (I). For simplicity, draw three water molecules surrounding one I ion.

5.) The Henry's Law constant for O3 in water at 25 °C is 1.2x10-2 M/atm. What pressure of O3, in atm, would be required to give a [O3] = 0.0275 M?   Your Answer:

Write an electroneutrality relationship for this water

Calculate the mass of oxygen (in mg) dissolved in a 2.50 L bucket of water exposed to a pressure of 2.13 atm of air.  Assume the mole fraction of oxygen in air to be 0.21 and the Henry's law constant for oxygen in water at this temperature to be 1.3 × 10-3 M/atm. Molar mass for oxygen (O2) is 31.9988 g/mol.     A. 46.5 mg   B. 27.0 mg   C. 13.7 mg   D. 23.5 mg   E. 9.87 mg

Which of the following is likely to have the highest conductivity? Deionized water (DI) Tap water ethanol (CH3CH2OH)

A water sample is to be treated using alum as Al2(SO4)3●14.2 H2O. The water has the following constituents:   mg/L Ca2+ 37 Na+ 6.5 Mg2+ 8.1 K+ 1.2 Fe3+ 1.0 HCO3- 119 SO42- 22 Cl- 20 NO3- 0.1 Is the water analysis complete according to the principle of electroneutrality?

Arrange the following in terms of increasing water solubility in section II and dipole moments in section III using the less than (<) inequality.

4. Calculate the molar concentration of oxygen in water at 25°C for a partial pressure of 0.22 atm. The Henry's law constant for oxygen is 1.3 x 103 mol/L. atm.

A small amount of methanol (CH, OH) is dissolved in a large amount of water. Imagine separating this process into the four stages sketched below. (These sketches show only a portion of the substances, so you can see the density and distribution of atoms and molecules in them.) A В CH;OH H,0 solution Use these sketches to answer the questions in the table below. The enthalpy of solution AH. is positive when soln CH3OH dissolves in water. Use this information to list the stages in order of increasing enthalpy. O absorbed Would heat be absorbed or released if the system moved from Stage A to B? O released O neither absorbed nor released O none O ionic bonding force O covalent bonding force O metal bonding force What force would oppose or favor the system moving from Stage A to B? Check all that apply. O hydrogen-bonding force O dipole force O ion-dipole force O dispersion force

What properties of an element and/or water causes particular elements on the periodic table (Potassium for example) to react violently with water?