Assignment 2 Buffer pH change (Moodle Submission only): A 10-mL buffer solution consisting of 0.2M Acetic Acid and 0.3M Sodium Acetate. Calculate the change in pH (ApH) upon adding 1mL of 0.1M HCl to this buffer solution. (Acetic acid K, is 1.77 x 10°)

Mass of evaporating dish 69.148 Mass of evaporating dish and KCl solution 77.885 Mass of KCl solution 8.737 Mass of evaporating dish and Kcl residue 71.125 Mass of Kcl residue 1.977 Find the mass of water of evaporated  Percent Kcl (by mass) in solution Volume of KCl solution (density of KCl solution is 1.12 g/mL) Moles of KCl residue Molarity of solution

1 of 4 Find the best match between the following terms with its correct definition phase homogeneous sample heterogeneous sample insoluble miscible immiscible : have two (2) or more phases. : a substance whose particles essentially do not intermingle appreciably with the particles of a second substance. : a liquid substance whose particles are able to mingle with those of another liquid substance. : •Distinguishable portions of a sample. :: a liquid substance whose particles are unable to mingle appreciably with those of another liquid substance. :: have only one (1) phase 1 4 Next»

If a water sample has 0.07 mol of calcium ions in 15 L solution, what is the water hardness level in mg/L? Pay attention to the unit. Hint: For the calcium mass , convert mol to g to mg. (1 mol calcium ion= 40.08 g/mol and 1 g = 1000 mg) Round and report your answer to an integer without decimal place. Report numeric value only, no unit. • Water hardness levels according to EPA Soft: 0-60 milligrams per liter (mg/L) as calcium carbonate Moderately hard: 61-120 mg/L as calcium carbonate • Hard: 121-180 mg/L as calcium carbonate Very hard: more than 180 mg/L as calcium carbonate