Calculate the pH of a solution formed by mixing 200.0 mL of 0.300 M NaHSO4 with 200.0 mL of 0.200 M Na2SO4 and 1.0 ml 1.00 M NaOH. The Ka2 for H2SO4 is 1.2 × 10-2.

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)