2) Kaylă drops a coil of metal wire, X(s), into a water solution of a metal sulfate, ZSO4(aq). Kayla observes that the colour of the solution changes, and that a metallic-looking substance appears to be forming on the metal wire. Based on these observations, answer the following: a. What type of reaction has taken place? Explain your answer b. Which metal is more reactive, metal X or metal Z? Explain your answer C. Write the names of a real metal and a metal sulfate that would behave this way in a laboratory.

You note that the Ksp of Ba3(PO4)2 is much smaller than that of Ba(OH)2. Therefore, you wonder if adding a phosphate species, such as H3PO4, can precipitate out more of the barium ions (Ba²+) from the solution (and then you could filter out the solid to have a smaller waste volume!). Therefore, you look up another equilibrium constant, shown for equation below: H3PO4 (aq) = 3 H+ (aq) + PO³ (aq) K₁ = 2.0 x 10-22 15. If you were to add H3PO4 to your waste solution to attempt to precipitate Ba3(PO4)2, what would be the equilibrium constant for the net reaction (shown below)? 3 Ba(OH) 2 (s) + 2 H3PO4 (aq) =6 H2O (l) + Ba3(PO4)2 (s) Kc

Based on the reading provided above, what is the most prevalent metal ion in bone and tooth enamel?

I am not sure how they calculated the ln 5. I would like to possibly see a more detailed step for this solution.