What mass of NH4Cl must be added to 0.750L if a 0.100M solution of NH3 to give a buffer solution with a pH if 9.26? (Hint: Assume a negligible change in volume as the solid is added.)

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.