Edta is a hexaprotic system with the pka values: pka1=0.00 , pka2=1.50 , pka3=2.00 , pka4=2.69 , pka5=6.13 , and pka6=10.37 . the distribution of the various protonated forms of edta will therefore vary with ph. for equilibrium calculations involving metal complexes with edta , it is convenient to calculate the fraction of edta that is in the completely unprotonated form, y4− . this fraction is designated − . calculate − at two ph values.

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation. 8. when a 2.5 mol of sugar (c12h22o11) are added to a certain amount of water the boiling point is raised by 1 celsius degree. if 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? show all calculations leading to your answer or use 3 – 4 sentences to explain your answer. 9. if 5.40 kcal of heat is added to 1.00 kg of water at 100⁰c, how much steam at 100⁰c is produced? show all calculations leading to an answer. 10. the freezing of water at 0⁰c can be represented as follows: h2o (l) ↔ h2o(s) the density of liquid water is 1.00 g/cm3. the density of ice is 0.92 g/cm3. in 3 – 4 sentences explain why applying pressure causes ice to melt.

7. in the cycle, a virus integrates its dna into the host's dna, and its dna is replicated when the host dna is replicated. a. infectious b. retroviral c. lysogenic d. lytic