1.successive plus and minus sights taken on a downhill line oflevels are listed. The values represent the horizontaldistances between the instrument and either the plus or minussights. What error results from curvature andrefraction?
10,50; 15,40; 5,50; 20,75 m
2.If the solubility product of magnesium hydroxide is 11.25 answerthe following question. If water at 25-degree C is bufferedsuch that the pH remains fixed at 7, what is the maximum amount ofsoluble Mg2+, in grams, in 1L of water?