2. Barium sulfate, BaSO4, is not very soluble in water. However, you can force it to dissolve by adding acid: BaSO4 (s) + HCl (aq)  Ba2+ (aq) + HSO4- (aq) + Cl- (aq)
Suppose you have 100.0 g of BaSO4 in a beaker, and you slowly add 500.0 mL of 0.200 M aqueous HCl, mixing well. Will all the BaSO4 dissolve?

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.