1.How could you determine the pH range over which a particular buffer system works best? 2.What are the pKa values for the various species of phosphoric acid and associated ions? Do your results agree with these values? Explain. 3.Provide an explanation for the shape of your graph for the Weak Acid/Strong Base titration. 4.Label the equivalence point/s, half equivalence points (corresponding to the pKas of phosphoric acid) and any buffer zones on your graph.

How do scientists think that gravity affected the formation of our solar system?

Both josef loschmidt and amedeo avogadro contributed to our understanding of basic molecular numbers, sizes, and reaction ratios. neither scientist discovered “avogadro’s number” in the form we use it today (6.02 x 10 23). still, there’s a controversy over the name. research the contributions from these two scientists and read about how avogadro’s number got its name. briefly state what you think this number should be called, providing key details of each scientist’s contributions to this concept and a solid rationale for your case in naming the number.

An alkaline battery produces electrical energy according to the following equation. zn(s) + 2 mno2(s) + h2o(l) zn(oh)2(s) + mn2o3(s) (a) determine the limiting reactant if 17.5 g zn and 31.0 g mno2 are used. (type your answer using the format ch4 for ch4.) (b) determine the mass of zn(oh)2 produced. _ g